@article{10_4153_CMB_1971_104_6,
     author = {Marica, John},
     title = {Orthogonal {Families} of {Sets}},
     journal = {Canadian mathematical bulletin},
     pages = {573--573},
     year = {1971},
     volume = {14},
     number = {4},
     doi = {10.4153/CMB-1971-104-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-104-6/}
}