Hiroshi Narushima. Principle of Inclusion-Exclusion on Semilattices. Journal of Combinatorial Theory, Series A, 17(2):196-203, 1974.
@article{Narushima74, title = {Principle of Inclusion-Exclusion on Semilattices}, author = {Hiroshi Narushima}, year = {1974}, researchr = {https://researchr.org/publication/Narushima74}, cites = {0}, citedby = {0}, journal = {Journal of Combinatorial Theory, Series A}, volume = {17}, number = {2}, pages = {196-203}, }