@article{GDZPPN002196425,
title = {Lattices freely generated by partially ordered sets: which can be "drawn"?},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {310},
year = {1979},
pages = {56-80},
zbl = {0416.06011},
url = {http://dml.mathdoc.fr/item/GDZPPN002196425}
}
Wille, Rudolf; Rival, Ivan. Lattices freely generated by partially ordered sets: which can be "drawn"?. Journal für die reine und angewandte Mathematik, Tome 310 (1979) pp. 56-80. http://gdmltest.u-ga.fr/item/GDZPPN002196425/