Article about military ciphers by cpt. Bedřich Frýbort, in "Vojenský svět", 1937, 11 and 12, vol. V. I. part, pp. 438-9, II.part: pp. 479-80, Title of the article in czech: "Šifrování":
Content of the article is probably about basic cipher systems used in military exercises in Czechoslovakia.
Member of the group C of cipher solutionists at Czechoslovak HQ of the Ministry of Defence headed by lieutenant colonel Josef RŮŽEK, in czech:"člen šifrové skupiny C HV MNO", according to Porubský, Š.: Application and Misapplication of the Czechoslovak STP cipher during WWII (report on an unpublished manuscript). In: Tatra Mountains Mathematical Publications, vol. 70, no. 3, p.47