@article{MZ_1933__37_168442,
     author = {L.J. Mordell},
     title = {The number of solutions of some congruences in two variables.},
     journal = {Mathematische Zeitschrift},
     pages = {193--209},
     year = {1933},
     volume = {37},
     zbl = {0007.00501},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__37_168442/}
}