Aleksandrov, P. S.; Gurfinkel’, V. S.; Oleinik, O. A.; Sinai, Ya. G.; Shilov, G. E. Sergei Vasil’evich Fomin (on the occasion of his 50th birthday). (Russian) Zbl 0153.31105 Vestn. Mosk. Univ., Ser. I 23, No. 2, 120-125 (1968). MSC: 01A70 PDFBibTeX XMLCite \textit{P. S. Aleksandrov} et al., Vestn. Mosk. Univ., Ser. I 23, No. 2, 120--125 (1968; Zbl 0153.31105)
Sinaĭ, Ya. G. On a “physical” system with positive “entropy”. (Über ein „physikalisches“ System mit positiver „Entropie“.) (Russian. English summary) Zbl 0126.41502 Vestn. Mosk. Univ., Ser. I 18, No. 5, 6-12 (1963). MSC: 37N15 PDFBibTeX XMLCite \textit{Ya. G. Sinaĭ}, Vestn. Mosk. Univ., Ser. I 18, No. 5, 6--12 (1963; Zbl 0126.41502)