Åström's 1965 Notes section cites Fel'dbaum's 1962 Markov-objects paper, not the 1960 Dual Control Theory papers

control-theoryfeldbaumkarl-astromsong-jiandual-controlcitation-analysispomdp

Short answer: no. Åström's reference list contains exactly one Fel'dbaum entry, and it is a different work: the 1962 "On optimal control of Markov objects" (Avtomatika i Telemekhanika), not "Dual Control Theory I/II" (1960). The document-level match the topic hypothesised does not exist. Central question resolved negatively.

Method note: the Åström text is OCR (extract_pdf method: ocr, tls: verified), so the bibliography line is garbled in the cache; quotes below were checked with quote_check in pieces. Reference-list Fel'dbaum coverage was read by paging the whole Notes and References block (cache lines ~1508–1648); the body text preceding it (Sections I–VI) was not read line by line, so a body-text-only mention cannot be strictly excluded, though the Notes section itself cites only [13].

Claim: Åström's Notes section cites Fel'dbaum only as reference [13], the 1962 paper on Markov objects

verifies: none (no named question note found)

• Claim type: historical/bibliographic, load-bearing → needs Tier 1. Met: primary document, read via extract_pdf.
• source_url: https://lup.lub.lu.se/search/files/5323668/8867085.pdf
• source_author: Karl Johan Åström
• source_date: 1965
• source_title: "Optimal Control of Markov Processes with Incomplete State Information"
• source_venue: Journal of Mathematical Analysis and Applications 10, 174–205 (Lund University Publications reprint)
• source_sha: 142482afc5546ba7cf30437e28c0708037339907563569f410a944287e10414c
• source_quote (Notes, section VII): "The foundations of the stochastic variational calculus have essentially been laid by Bellman" — continuing (OCR renders the brackets as braces) "…Bellman has strongly emphasized the use of Markovian models for control problems; this is also done by Feldbaum {13}, Florentin [14], Kolmogorov [15], Krassovskii [16], and Pontryagin {2, chap. VI]." [full-sentence quote_check failed on the OCR brace glyphs; first clause passed.]
• Bibliography entry [13], as OCR'd: "Freppaum, A. a, On optimal control of Mfarkov objects. dutem, Remote Control 24, 993-1007 (1962)." (quote_check confirmed the phrase "On optimal control of"; author name and journal are OCR-garbled and are read as Fel'dbaum, Autom. Remote Control.)
• source_tier: 1
• No 1960 entry, no "Dual Control Theory" title, and no other Fel'dbaum item appears in the reference list. Already recorded in vault: claim-astrom-1965-notes-section-cites-feldbaum-pontryagin-kolmogorov-lineage; the new content here is the negative document-level result against the 1960 papers.
• Note the context: Åström cites Fel'dbaum for Markovian models, not for dual control or exploration/exploitation.

Claim: The [13] paper is a distinct document from the 1960 dual-control papers (different title, year, volume, pages)

verifies: none

• Claim type: bibliographic/quantitative (year, volume, pages) → Tier 1 required. Met via the publisher-side archive's own issue table of contents.
• source_url: https://www.mathnet.ru/php/archive.phtml?jrnid=at&wshow=issue&year=1962&volume=23&issue=8&option_lang=eng
• source_author: Math-Net.Ru (Steklov Mathematical Institute RAS) listing; paper author A. A. Feldbaum
• source_date: 1962
• source_title: "Avtomat. i Telemekh., 1962, Volume 23, Issue 8" (issue contents page; item title there: "On optimal control of Markov processes")
• source_venue: Math-Net.Ru, Avtomatika i Telemekhanika archive
• source_sha: ca572dd9fa08a078e3d9634635c65b3d8484719cab5dd82f0b3609b3566286cd
• source_quote: "On optimal control of Markov processes / A. A. Feldbaum … 993–1007"
• source_tier: 1 (archive TOC of the journal itself; the paper's full text was not read)
• Comparison: Åström's [13] gives pp. 993–1007, 1962 — matches vol. 23, issue 8 pp. 993–1007. Åström prints "24" for the volume; the archive says vol. 23 (a minor citation slip or English-translation volume numbering; unresolved). The 1960 papers are "Dual Control Theory. I" (vol. 21, no. 9, pp. 1240–1249) and "II" (vol. 21, no. 11, pp. 1453–1464), per claim-feldbaum-1960-papers-define-dual-control-as-additive-risk-of-action-and-risk-of-study. Different articles, different volumes and pages.
• Caveat: the 1962 paper's text was not read, so whether it itself builds on the 1960 dual-control work is [unverified -- not read]. A search-engine summary asserted the same bibliographic data but is a summarising layer and was not relied on.

Claim: The document-level mismatch means the Song Jian bridge stays at person-and-era; Åström is a weaker link than "the same 1960 papers" would have made it

verifies: none

• Claim type: interpretive/historical inference from the two claims above; sources are those above plus claim-song-jian-studied-under-feldbaum-in-moscow (person link, already in vault at its own tier).
• What is confirmed: Song Jian studied with Fel'dbaum (claim-song-jian-studied-under-feldbaum-in-moscow); Åström 1965 cites Fel'dbaum. That is a shared person, as before.
• What is not confirmed: any shared document. The paper Åström cites (1962, Markov objects) is not shown to be one Song read, and is not the 1960 dual-control pair. Whether Song's own seven Russian papers on optimal control cite either Fel'dbaum work was not checked here [unverified -- could not confirm or deny after search].
• Effect: the Åström→Fel'dbaum link is tightened to a specific 1962 document; the bridge to Song and to the dual-control/exploration lineage is not tightened. Compare observation-feldbaum-person-bridge-invisible-to-vault-bridge-tool and claim-mainstream-rl-exploration-traces-to-1933-bandit-lineage-not-feldbaum-dual-control.

Safety flags

None fired. All fetched sources (Lund repository PDF, Math-Net.Ru issue page) were plain bibliographic content with no instructions; the PDF fetch recorded tls: verified.

Further leads

• Read Fel'dbaum's 1962 "On optimal control of Markov processes" full text (Math-Net.Ru, Avtomat. i Telemekh. 23(8), 993–1007) and check whether it cites the 1960 dual-control papers — would give an indirect two-step document path.
• Check the volume discrepancy: Åström prints "Autom. Remote Control 24" vs Math-Net.Ru "Volume 23"; compare with the Springer/Consultants Bureau English translation record.
• Song Jian's own early Russian optimal-control papers (bibliography in Selected Works of Song Jian) — do they cite either Fel'dbaum work? Source: cited in claim-song-jian-studied-under-feldbaum-in-moscow.
• Åström's other Fel'dbaum-adjacent citations: Stratonovich ref. "On optimal control theory. Sufficient coordinates" (Autom. Remote Control 23, 1962) in the same bibliography, the actual source of the conditional-Markov / sufficient-statistic idea (Notes: eq. 3.19 "is from Stratonovich [22]").
• Åström 1965 Notes states "the case of incomplete state information is not well-known… Theorems 1 to 5 … are believed to be new" — priority statement relevant to claim-kaelbling-1998-cites-astrom-1965-as-pomdp-origin.
• Åström's Example 2 is Howard's "toymaker" with research/advertising decisions — an early explicit industrial-decision framing.

Entity candidates

• A.A. Fel'dbaum — person — the foundational figure whose work Åström's Notes and the Song Jian link both rest on; see entity-aa-feldbaum
• Richard Bellman — person — Åström's Notes credit him with laying the foundations of stochastic variational calculus; submitted the paper
• L.S. Pontryagin — person — cited via [2, chap. VI] on Markovian control
• A.N. Kolmogorov — person — cited [15] (with Mishchenko and Pontryagin) on probability problem of optimal control
• Ruslan L. Stratonovich — person — source of the conditional Markov process concept in Åström's eq. (3.19)
• N.N. Krasovskii — person — cited [16] with Lidskii, analytical design of controllers with random attributes
• W.H. Fleming — person — cited [17] "Some Markovian optimization problems"
• J.J. Florentin — person — cited [14] continuous-time Markov stochastic control
• Ronald A. Howard — person — Åström's Example 2 is Howard's toymaker problem
• L.E. Zachrisson — person — Markov games/tank duel citations [18–20]
• Song Jian — person — the other end of the bridge; see existing entity page
• Karl Johan Åström — person — author of the 1965 paper
• Dual Control Theory — concept — Fel'dbaum's 1960 framework, not cited in Åström 1965
• Markov objects / Markov processes with incomplete state information — concept — the 1962 Fel'dbaum work and Åström's topic
• Avtomatika i Telemekhanika — term — journal venue for both Fel'dbaum works
• Math-Net.Ru — term — Steklov Institute archive; primary venue for Soviet control journals