@article{Drzewiński:2009,
author
=
"A.Drzewiński and J.Sznajd",
title
=
"Quantum XY and Heisenberg models on the planar lattices - the renormalization group approach",
journal
=
"Physica B: Condensed Matter",
volume
=
"Vol. 165-166",
pages
=
"223--224",
year
=
"1990",
}