Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1984__34_1_a1, author = {H{\'\i}c, Pavol}, title = {On partially directed $P$-graphs}, journal = {Mathematica slovaca}, pages = {25--34}, publisher = {mathdoc}, volume = {34}, number = {1}, year = {1984}, mrnumber = {735935}, zbl = {0608.05037}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1984__34_1_a1/} }
Híc, Pavol. On partially directed $P$-graphs. Mathematica slovaca, Tome 34 (1984) no. 1, pp. 25-34. http://geodesic.mathdoc.fr/item/MASLO_1984__34_1_a1/