@article{article9ab79ef3,
title   = {Some extensions of the Poincare-Birkhoff theorem to the cylinder and a remark on mappings of the torus homotopic to Dehn twists},
author = {Addas-Zanata, Salvador},
year = {2005},
doi = {10.1088/0951-7715/18/5/018},
journal   = {Nonlinearity}
}