@article{KYB_1970_6_6_a1,
     author = {Picard, C.-F.},
     title = {Quasi-questionnaires, codes and {Huffman's} length},
     journal = {Kybernetika},
     pages = {418--435},
     year = {1970},
     volume = {6},
     number = {6},
     mrnumber = {0284274},
     zbl = {0215.30901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1970_6_6_a1/}
}