@article{10_1017_S0017089500006030,
     author = {Cassels, J. W. S.},
     title = {A diophantine equation},
     journal = {Glasgow mathematical journal},
     pages = {11--18},
     year = {1985},
     volume = {26},
     doi = {10.1017/S0017089500006030},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006030/}
}