@article{10_1017_S0017089500007862,
     author = {Brown, Ezra},
     title = {x4 + dx2y2 + y2= z2: {Some} cases with only trivial solutions{\textemdash}and a solution {Euler} missed},
     journal = {Glasgow mathematical journal},
     pages = {297--307},
     year = {1989},
     volume = {31},
     number = {3},
     doi = {10.1017/S0017089500007862},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007862/}
}