@article{KUIPM_1977_a1,
     author = {Ya. I. Zabotin},
     title = {A class of quasiconcave functionals and the optimal redundancy problem},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {11--14},
     publisher = {mathdoc},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1977_a1/}
}