@article{MZ_1972__126_171738,
     author = {Derek A. Waller},
     title = {On the {Weak} {Covering} {Homotopy} {Property.}},
     journal = {Mathematische Zeitschrift},
     pages = {243--246},
     publisher = {mathdoc},
     volume = {126},
     year = {1972},
     zbl = {0223.55022},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171738/}
}