@article{KYB_1971_7_5_a0,
     author = {Pugachev, V. S.},
     title = {Optimal learning systems},
     journal = {Kybernetika},
     pages = {347--376},
     year = {1971},
     volume = {7},
     number = {5},
     mrnumber = {0297414},
     zbl = {0268.68037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1971_7_5_a0/}
}