@article{Grytczuk:2009,
author
=
"A.Grytczuk and I.Kurzydło",
title
=
"On the matrix negative pell equation",
journal
=
"Discussiones Mathematicae - General Algebra and Applications",
volume
=
"Vol. 29",
number
=
"no 1",
pages
=
"35--45",
year
=
"2009",
}