@article{article0e68c917,
title   = {A characterization of annularity for area-preserving toral homeomorphisms},
author = {Guelman, Nancy and Koropecki, Andres and Tal, Fábio Armando},
year = {2014},
doi = {10.1007/s00209-013-1218-x},
journal   = {Mathematische Zeitschrift}
}