@article{10_4153_CJM_1977_040_3,
     author = {Kelly, David},
     title = {The {3-Irreducible} {Partially} {Ordered} {Sets}},
     journal = {Canadian journal of mathematics},
     pages = {367--383},
     year = {1977},
     volume = {29},
     number = {2},
     doi = {10.4153/CJM-1977-040-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-040-3/}
}