@article{AM2_1986__31_137140,
     author = {P.A. Winter and Henda C. Swart},
     title = {2-3 graphs which have {Vizing's} adjacency property.},
     journal = {Aequationes mathematicae},
     pages = {34--36},
     publisher = {mathdoc},
     volume = {31},
     year = {1986},
     zbl = {0616.05036},
     url = {http://geodesic.mathdoc.fr/item/AM2_1986__31_137140/}
}