TY - JOUR AU - Bagchi, Haridas TI - Note on the two congruences $ax^2 + by^2 + e \equiv 0$, $ax^2 + by^2 + cz^2 + dw^2 \equiv 0 \: (\text{mod. } p)$, where $p$ is an odd prime and $a \lnot \equiv 0$, $b \lnot \equiv 0$, $c \lnot \equiv 0$, $d \lnot \equiv 0 \: (\text{mod. } p)$ JO - Rendiconti del Seminario Matematico della Università di Padova PY - 1949 SP - 311 EP - 315 VL - 18 PB - Seminario Matematico of the University of Padua UR - http://archive.numdam.org/item/RSMUP_1949__18__311_0/ LA - en ID - RSMUP_1949__18__311_0 ER -