“…The technique of using the Russian abacus is described in Russian in the following works: Apokin and Maistrov (1990), Emenov (1940), Evtushevsky (1871), Gagin (1960), Guter and Polunov (1981), Kazakova (2011), Khvatov (1924), Kiryushin (1925), Kononenko (1960), Simonov (1975, 1987, 1988, 1990, 1993, 1997), Spassky (1952), Tikhomirov (1830), Vilenchik (1984) and Zorin (1907). In English, the application of the schoty in Russia is considered in articles on the history of computing technology without their use in accounting: Aspray (2000), Carr (1805) , Croix (1956), Duus (1998), Ryan (1972, 1991), Shilov and Silantiev (2017), Thompson (1906) and Volkov (2018). The study of abacus in Europe is considered by Du stchote ou machine… (1839), Gouzevitch and Gouzevitch (1998), and Hoppe (1952).…”