Bagchi, Haridas
Note on the two congruences ax 2 +by 2 +e0, ax 2 +by 2 +cz 2 +dw 2 0(mod.p), where p is an odd prime and a¬0, b¬0, c¬0, d¬0(mod.p)
Rendiconti del Seminario Matematico della Università di Padova, Tome 18 (1949) , p. 311-315
Zbl 0033.01202
URL stable : http://www.numdam.org/item?id=RSMUP_1949__18__311_0