BN Service hongrois
Biogr. Hongrie
Encyclopedic dictionary of mathematics, 1987 : Hajós, György (Georg), 1912-1972
Hungarian problem book : based on the Eötvös competitions ... / orig. comp. by József
Kürschák ; rev. and ed. by G. Hajós, G. Neukomm, J. Surányi ; transl. by Elvira Rapaport,
1963
LCNA (CD OCLC), 1993-09