@article{10_4153_CMB_1973_086_2,
     author = {Greenwell, D. L. and Kronk, H. V.},
     title = {Uniquely {Line} {Colorable} {Graphs}},
     journal = {Canadian mathematical bulletin},
     pages = {525--529},
     year = {1973},
     volume = {16},
     number = {4},
     doi = {10.4153/CMB-1973-086-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-086-2/}
}