%0 Journal Article %A Brown, Ezra %T x4 + dx2y2 + y2= z2: Some cases with only trivial solutions—and a solution Euler missed %J Glasgow mathematical journal %D 1989 %P 297-307 %V 31 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007862/ %R 10.1017/S0017089500007862 %F 10_1017_S0017089500007862