In 1949 Olga defended her doctoral dissertation (comparable to an habilitation) which was on the development of finite differences methods for linear and quasilinear hyperbolic systems of partial differential equations, formally supervised by Sobolev though in practice it was Smirnov .
Sa 1949 Olga defended kanyang doktor disertasyon (maihahambing sa isang habilitation) na kung saan ay sa wakas ang pag-unlad ng mga pagkakaiba na pamamaraan para sa pahaba at quasilinear hayperboliko sistema ng bahagyang kaugalian equation, pormal supervised by Sobolev bagaman sa practice ito ay Smirnov.