@article{10_4064_fm_146_2_141_152,
     author = {Bobby Winters},
     title = {Properly homotopic nontrivial planes are isotopic},
     journal = {Fundamenta Mathematicae},
     pages = {141--152},
     publisher = {mathdoc},
     volume = {146},
     number = {2},
     year = {1994},
     doi = {10.4064/fm-146-2-141-152},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-146-2-141-152/}
}