Golubnichy, P. I. et al. High-Efficiency Magnetic Pair Spectrometer (Magnitnyi parnyi spektrometr vysokoi effektivnosti), 1968. In Russian

Голубничий П. И., Курдадзе Л. М., Николенко Д. М., Онучин А. П., Попов С. Г., Сидоров В. А. Магнитный парный спектрометр высокой эффективности : Препринт / ИЯФ СО АН СССР.
Новосибирск: ИЯФ СО АН СССР, 1968.
20 с. Обложка, обычный формат. Тираж: 200 экз. Ротапринт. 
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Golubnichy, P. I.; Kurdadze, L. M.; Nikolenko, D. M.; Onuchin, A. P.; Popov, S. G.; Sidorov, V. A. High-Efficiency Magnetic Pair Spectrometer: Preprint / Institute of Nuclear Physics, Siberian Branch of the USSR Academy of Sciences.
Novosibirsk: Institute of Nuclear Physics SB USSR Academy of Sciences, 1968.
20 pp. Original wrappers, standard format. Print run: 200 copies. Rotaprint. 

This 1968 preprint represents a rare primary source from the "Golden Age" of the Novosibirsk Institute of Nuclear Physics (IYF). Published in a tiny edition of only 200 copies for internal academic circulation, it details the technical design and experimental characteristics of a high-efficiency magnetic pair spectrometer. This instrument was developed for the study of high-energy gamma-ray spectra, a critical component in the particle physics experiments conducted at the Siberian Branch of the USSR Academy of Sciences. The authorial team includes prominent figures like Viktor Sidorov, who played a key role in the development of the first Soviet colliders. As a rotaprint "preprint," this document was never intended for wide distribution, making surviving copies significant artifacts for historians of Soviet science and nuclear instrumentation.