1977
Georgios Flessas, On an analytical angular momentum projection method, Lettere al Nuovo Cimento, Vol = 19, pp. = 0, , 534, 1977,   
Georgios Flessas, C. Syros, On the quantization of the Liouville equation, Lettere al Nuovo Cimento, Vol = 19, pp. = 0, , 534, 1977,   
1976
Georgios Flessas, Nuclear rotation for low and high spin values, Zeitschrift fur Physik, Vol = 279, pp. = 0, , 187, 1976,   
1973
Georgios Flessas, THESIS TU WIEN, THESIS TU WIEN, Vol = , pp. = 0, , , 1973,