@article{10_4153_CMB_2002_045_2,
     author = {Mollin, R. A.},
     title = {Criteria for {Simultaneous} {Solutions} of {X} 2 \ensuremath{-} {DY} 2 = c and x 2 \ensuremath{-} {Dy} 2 = \ensuremath{-}c},
     journal = {Canadian mathematical bulletin},
     pages = {428--435},
     year = {2002},
     volume = {45},
     number = {3},
     doi = {10.4153/CMB-2002-045-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2002-045-2/}
}