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Books about Kotzig:
Theory and Practice of Combinatorics: A Collection of Articles Honoring Anton Kotzig on the Occasion of His Sixtieth... by Alexander Rosa, Gert Sabidussi and Jean Turgeon (Oct 1982)
Wiki information Kotzig:
Anton Kotzig was a Slovak–Canadian mathematician, expert in statistics, combinatorics and graph theory. The Ringel-Kotzig conjecture on graceful labeling of trees is named after him and Gerhard Ringel.