@article{MZ_1980__172_172946,
     author = {Charles T.C. Wall},
     title = {Relatively {1-Dimensional} {Complexes.}},
     journal = {Mathematische Zeitschrift},
     pages = {77--80},
     publisher = {mathdoc},
     volume = {172},
     year = {1980},
     zbl = {0428.57005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__172_172946/}
}