@article{10_4153_CJM_1972_097_9,
     author = {Yocom, K. L.},
     title = {Unique {Factorization} {Theorems} for {Subalgebras} of the {Incidence} {Algebra}},
     journal = {Canadian journal of mathematics},
     pages = {967--977},
     year = {1972},
     volume = {24},
     number = {5},
     doi = {10.4153/CJM-1972-097-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-097-9/}
}