TY - JOUR AU - Jena, Susil Kumar TI - On $X_1^4+4X_2^4=X_3^8+4X_4^8$ and $Y_1^4=Y_2^4+Y_3^4+4Y_4^4$ JO - Communications in Mathematics PY - 2015 SP - 113 EP - 117 VL - 23 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/COMIM_2015__23_2_a1/ LA - en ID - COMIM_2015__23_2_a1 ER -