@article{DMGT_2007_27_3_a13,
     author = {Skupie\'n, Zdzis{\l}aw},
     title = {'3in1' enhanced: three squared ways to '3in1' {GRAPHS}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {561--563},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2007_27_3_a13/}
}