---
title: "LeCun et al.'s two 1989 ZIP-code papers appeared in a bimodal order: the NIPS conference paper was presented first (Nov 1989), the Neural Computation article was printed first (Dec 1989), and the NIPS proceedings volume only appeared in 1990"
type: "claim"
status: "budding"
audit_status: "bibliographic-verified via convergent Tier-1/2 structured catalogs (dblp, Open Library, OpenAlex/Crossref); no primary paper text needed — these are dated publication facts, not mechanism claims. | 2026-07-09 scheduled audit (auditor claude-fable-5; writer same model per provenance — weaker check): dblp citation string re-verified verbatim; Crossref DOI re-pulled — published-print is 1989-12 at month precision, and the former 'Dec 1, 1989' day was OpenAlex date-normalization, not a Crossref fact; body softened to 'December 1989'. Ordering conclusion (NIPS presentation Nov 1989 → NC print Dec 1989 → NIPS 2 volume 1990) unchanged."
source_url: "https://dblp.org/rec/conf/nips/1989.html"
source_title: "dblp: Advances in Neural Information Processing Systems 2, [NIPS Conference, Denver, Colorado, USA, November 27-30, 1989]"
source_author: "dblp; Open Library; OpenAlex (Crossref-sourced)"
source_date: "2026-07-09T00:00:00.000Z"
source_tier: 1
source_quote: "Advances in Neural Information Processing Systems 2, [NIPS Conference, Denver, Colorado, USA, November 27-30, 1989]. Morgan Kaufmann 1990"
provenance: "Promotion from 10-inbox/raw/2026-07-09-which-appeared-first-lecun-et-als-nips-1989.md, 2026-07-09, Fable clean-lane promotion marathon."
origin: "batch"
derived_from: ["20260709-0230-which-appeared-first-lecun"]
date_created: "2026-07-09T00:00:00.000Z"
tags: ["lecun","bell-labs","backpropagation","nips","neural-computation","zip-codes","history-of-ml","bibliography"]
audits: ["2026-07-09 claude-fable-5"]
---


LeCun's Bell Labs group published closely related handwritten-digit work twice in
1989: the NIPS conference paper "Handwritten Digit Recognition with a
Back-Propagation Network" (Advances in NIPS 2, pp. 396–404) and the Neural
Computation journal article "Backpropagation Applied to Handwritten Zip Code
Recognition" ([[claim-lecun-1989-first-practical-recognition]]). "Which appeared
first" has two correct answers, and citing "LeCun et al. 1989" without specifying
the venue gets the sequencing backwards:

- **By presentation:** the NIPS conference paper came first — the conference was
  held Nov 27–30, 1989 in Denver (dblp: "NIPS Conference, Denver, Colorado, USA,
  November 27-30, 1989. Morgan Kaufmann 1990").
- **By printed publication date:** the Neural Computation article came first — in
  print December 1989 (Crossref published-print 1989-12, DOI
  10.1162/neco.1989.1.4.541; OpenAlex normalizes this to 1989-12-01), Volume 1,
  Issue 4, pp. 541–551.
- **The NIPS 2 proceedings volume** that formally contains the conference paper
  was not printed until **1990** (dblp "Morgan Kaufmann 1990"; Open Library
  first_publish_year 1990) — a year after the conference, even though the
  NeurIPS archive retroactively labels it "NIPS 1989."

So: NIPS presentation (Nov 1989) → Neural Computation print (Dec 1989) → NIPS
proceedings volume in print (1990). The "1989" on the conference paper is the
conference year used as a citation label, not the volume's print date. See
[[moc-backpropagation-origins]].