Bulgarian Academy of Sciences
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- L Iliev, Development of mathematics in the People's Republic of Bulgaria (Bulgarian), Fiz.-Mat. Spis. B cdprime lgar. Akad. Nauk. 26(59) (3) (1984), 254-271.
- N D Naplatanov, The development, achievements and perspectives in technical cybernetics in the Bulgarian Academy of Science (Bulgarian), B'lgar. Akad. Nauk. Otdel. Tehn. Nauk. Izv. Inst. Tehn. Kibernet. 11 (1969), 5-36.