A simple criterion for solvability of both X2-DY2=c and x2-Dy2=-c.
Mollin, R.A.
The New York Journal of Mathematics [electronic only], Tome 7 (2001), p. 87-97 / Harvested from The Electronic Library of Mathematics
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Publié le : 2001-01-01
EUDML-ID : urn:eudml:doc:122006 
@article{01642943,
     title = {A simple criterion for solvability of both },
     journal = {The New York Journal of Mathematics [electronic only]},
     volume = {7},
     year = {2001},
     pages = {87-97},
     zbl = {0993.11016},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01642943}
}

Mollin, R.A. A simple criterion for solvability of both . The New York Journal of Mathematics [electronic only], Tome 7 (2001) pp. 87-97. http://gdmltest.u-ga.fr/item/01642943/