@article{MZ_1961__75_169914,
     author = {F.M. Sioson},
     title = {Some primal {Clusters.}},
     journal = {Mathematische Zeitschrift},
     pages = {201--210},
     year = {1961},
     volume = {75},
     zbl = {0095.02202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__75_169914/}
}