The Redheffer matrix of a partially ordered set.
Wilf, Herbert S.
The Electronic Journal of Combinatorics [electronic only], Tome 11 (2004), / Harvested from The Electronic Library of Mathematics
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Publié le : 2004-01-01
EUDML-ID : urn:eudml:doc:125375 
@article{02161269,
     title = {The Redheffer matrix of a partially ordered set.},
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {11},
     year = {2004},
     zbl = {1077.15009},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02161269}
}

Wilf, Herbert S. The Redheffer matrix of a partially ordered set.. The Electronic Journal of Combinatorics [electronic only], Tome 11 (2004) . http://gdmltest.u-ga.fr/item/02161269/