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@article{DM_1991_3_2_a10, author = {I. D. Kan}, title = {M\"obius functions of the union of partial orders}, journal = {Diskretnaya Matematika}, pages = {121--127}, publisher = {mathdoc}, volume = {3}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_1991_3_2_a10/} }
I. D. Kan. M\"obius functions of the union of partial orders. Diskretnaya Matematika, Tome 3 (1991) no. 2, pp. 121-127. http://geodesic.mathdoc.fr/item/DM_1991_3_2_a10/