@article{10_4064_fm172_2_1,
     author = {D. L. Goncalves and M. R. Kelly},
     title = {Maps into the torus and
minimal coincidence sets for homotopies},
     journal = {Fundamenta Mathematicae},
     pages = {99--106},
     publisher = {mathdoc},
     volume = {172},
     number = {2},
     year = {2002},
     doi = {10.4064/fm172-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm172-2-1/}
}