@article{articlee14cdd70,
title   = {Obstruction theory and coincidences of maps between nilmanifolds},
author = {Gonçalves, Daciberg Lima and Wong, Peter Negai-Sing},
year = {2005},
doi = {10.1007/s00013-004-1143-7},
journal   = {Archiv der Mathematik}
}