@article{KYB_1973_9_5_a3,
     author = {Nieminen, U. J.},
     title = {The block plan problem. {A} graphtheoretic approach},
     journal = {Kybernetika},
     pages = {365--373},
     year = {1973},
     volume = {9},
     number = {5},
     mrnumber = {0351431},
     zbl = {0264.90030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1973_9_5_a3/}
}