@article{10_4153_CMB_1968_014_6,
     author = {Cl\'eroux, Robert},
     title = {On the {Evaluation} of {Some} {Expressions} {Concerning} the {PBIB} {Designs}},
     journal = {Canadian mathematical bulletin},
     pages = {107--114},
     year = {1968},
     volume = {11},
     number = {1},
     doi = {10.4153/CMB-1968-014-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-014-6/}
}