@article{00147582, title = {Unordered love in infinite directed graphs.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {15}, year = {1992}, pages = {753-756}, doi = {10.1155/S0161171292000978}, zbl = {0771.05046}, language = {en}, url = {http://dml.mathdoc.fr/item/00147582} }
Johnson, Peter D.jun. Unordered love in infinite directed graphs.. International Journal of Mathematics and Mathematical Sciences, Tome 15 (1992) pp. 753-756. doi : 10.1155/S0161171292000978. http://gdmltest.u-ga.fr/item/00147582/