Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{AM2_1972__8_136273, author = {S.P. Avann}, title = {The {Lattice} of {Natural} {Partial} {Orders.}}, journal = {Aequationes mathematicae}, pages = {95--102}, publisher = {mathdoc}, volume = {8}, year = {1972}, zbl = {0251.06005}, url = {http://geodesic.mathdoc.fr/item/AM2_1972__8_136273/} }
S.P. Avann. The Lattice of Natural Partial Orders.. Aequationes mathematicae, Tome 8 (1972), pp. 95-102. http://geodesic.mathdoc.fr/item/AM2_1972__8_136273/