@article{MAN_1969__182_161859,
     author = {G. CHARTRAND and M.J. STEWART},
     title = {The {Connectivity} of {Line-Graphs.}},
     journal = {Mathematische Annalen},
     pages = {170--174},
     publisher = {mathdoc},
     volume = {182},
     year = {1969},
     zbl = {0167.52203},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__182_161859/}
}