@article{10_4064_cm_31_2_207_210,
     author = {P. H. Doyle},
     title = {Two criteria thrusting simple connectedness on manifolds},
     journal = {Colloquium Mathematicum},
     pages = {207--210},
     year = {1974},
     volume = {31},
     number = {2},
     doi = {10.4064/cm-31-2-207-210},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-31-2-207-210/}
}