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2. Almár, I.: Some problems of the treatment of visual satellite observations with the method of A.M. Losinski (in Russian), in: Bonev, N., Ivanova. V. (Eds.), Blgarska Akademia na Naukite, Sofia, Nabl. ISZ No. 7, pp. 111–115, 1968.
3. Analysis of the atmospheric drag of the Echo-1 satellite using the PERLO orbital period determination program;Almár,1970
4. Almár, I., Horváth, A., Illés-Almár, E. Investigation of the period changes in May 1966 of eight satellites derived by the PERLO orbital determination program (in Russian), in: Dobaczewska W. et al. (Eds.), Polska Akademia NAUK, Warszawa, Nabl. ISZ No. 9, pp. 285–300, 1970b.
5. Almár, I., Ill, M. International co-operation in the investigation of some geophysical quantities based on base-line observations of artificial satellites (in Russian), in: Erpilov. N.P. (Ed.), Astrosoviet AN SSSR, Moscow, Nabl. ISZ No.1. 1959–1962, pp. 46–50, 1962.