This letter "M" is in Russian alphabet, have different Unicode code than in English alphabet (affects search). /wiki/Russian_alphabet
"The Fast Universal Digital Computer M-2. Russian Virtual Computer Museum. English version. Articles". Computer-museum.ru. Retrieved 2012-12-01. http://www.computer-museum.ru/english/m2.htm
Malinovsky 2010, pp. 71–72. - Malinovsky, Boris Nikolaevich (2010). "Pioneers Of Soviet Computing". archive.org. Retrieved 2018-05-23. https://archive.org/stream/PioneersOfSovietComputing/Pioneers%20of%20Soviet%20Computing