@article{01345964, title = {On sums over partially ordered sets.}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {6}, year = {1999}, zbl = {0936.06001}, language = {en}, url = {http://dml.mathdoc.fr/item/01345964} }
Dohmen, Klaus. On sums over partially ordered sets.. The Electronic Journal of Combinatorics [electronic only], Tome 6 (1999) . http://gdmltest.u-ga.fr/item/01345964/