@article{articleda438c67,
title   = {Maps between surfaces and minimal coincidence sets for homotopies: theory of fixed points and its applications},
author = {Gonçalves, Daciberg Lima and Kelly, Michael R.},
year = {2001},
doi = {10.1016/S0166-8641(00)00084-5},
journal   = {Topology and its Applications}
}