@article{MM2_1970__2_154002,
     author = {Walter Wessel},
     title = {Kanten-kritische {Graphen} mit der {Zusammenhangszahl} 2.},
     journal = {Manuscripta mathematica},
     pages = {309--334},
     publisher = {mathdoc},
     volume = {2},
     year = {1970},
     zbl = {0193.24202},
     url = {http://geodesic.mathdoc.fr/item/MM2_1970__2_154002/}
}