@article{10_4153_CJM_1970_144_8,
     author = {Clements, G. F.},
     title = {On {Existence} of {Distinct} {Representative} {Sets} for {Subsets} of a {Finite} {Set}},
     journal = {Canadian journal of mathematics},
     pages = {1284--1292},
     year = {1970},
     volume = {22},
     number = {6},
     doi = {10.4153/CJM-1970-144-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-144-8/}
}