@article{DMTCS_2000_4_1_a3,
     author = {Dohmen, Klaus},
     title = {Improved inclusion-exclusion identities via closure operators},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2000-2001},
     doi = {10.46298/dmtcs.275},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.275/}
}