Nikola Obreshkov
Nikola Dimitrov Obreshkov (; March 6, 1896 in VarnaAugust 11, 1963 in Sofia) was a prominent Bulgarian mathematician, working in complex analysis. See also
Obreschkoff–Ostrowski theorem

References
 European Mathematics Society Newsletter No. 51 (PDF), page 28. Nikola Obrechkoff

20th-century Bulgarian mathematicians
1896 births
1963 deaths
Members of the Bulgarian Academy of Sciences
People from Varna, Bulgaria