Bayer, V. N. Violation of CP Invariance in Decays of Neutral Kaons (Narushenie CP-invariantnosti v raspadakh neytral'nykh kaonov), 1973. In Russian.

Байер В. Н.
Нарушение CP-инвариантности в распадах нейтральных каонов: Препринт.
Новосибирск : Институт ядерной физики СО АН СССР (ИЯФ), 1973. (Препринт ИЯФ 17-73).
40 с. Мягкая издательская обложка (ротапринт), обычный формат. Тираж 200 экз. Подписано к печати 22.02.1973.
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Bayer, V. N.
Violation of CP Invariance in Decays of Neutral Kaons (Narushenie CP-invariantnosti v raspadakh neytral'nykh kaonov).
Novosibirsk : Institute of Nuclear Physics SB USSR Academy of Sciences (IYAF), 1973. (Preprint INF 17-73).
40 pp. Publisher's softcover (rotaprint), standard format. Print run: 200 copies. Signed for print Feb 22, 1973.

This 1973 preprint is a rare and significant document in the history of high-energy physics, originating from one of the world's leading centers for nuclear research: the Budker Institute of Nuclear Physics (IYAF) in Novosibirsk. Written by the distinguished theoretical physicist Vladimir Nikolaevich Bayer, this paper tackles one of the most profound puzzles in modern physics—the violation of CP-invariance (Charge conjugation Parity symmetry).