@book{Barbeau-Pell-2003,
  mrnumber = {MR1949691 (2004f:11024)},
  author = {Barbeau, Edward J.},
  mrclass = {11D09 (11-01)},
  series = {Problem Books in Mathematics},
  mrreviewer = {George W. Grossman},
  address = {New York},
  title = {Pell's equation},
  isbn = {0-387-95529-1},
  publisher = {Springer-Verlag},
  year = {2003},
  pages = {xii+212},
}