@article{10_4153_CMB_1976_064_1,
     author = {Chv\'atal, V\'aclav and Kotzig, Anton and Rosenberg, Ivo G. and Davies, Roy O.},
     title = {There are 2א\ensuremath{\alpha} {Friendship} {Graphs} of {Cardinal} א\ensuremath{\alpha}},
     journal = {Canadian mathematical bulletin},
     pages = {431--433},
     year = {1976},
     volume = {19},
     number = {4},
     doi = {10.4153/CMB-1976-064-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-064-1/}
}