@article{MAN_1972__196_162249, author = {Bjarne Toft}, title = {On {Separating} {Sets} of {Edges} in {Contraction-Critical} {Graphs.}}, journal = {Mathematische Annalen}, pages = {129--147}, publisher = {mathdoc}, volume = {196}, year = {1972}, zbl = {0219.05059}, url = {http://geodesic.mathdoc.fr/item/MAN_1972__196_162249/} }