@article{DAN_1972_205_1_a4,
     author = {E. B. Kinber},
     title = {Frequency calculations o f general recursive predicates and frequency enumeration of sets},
     journal = {Doklady Akademii Nauk},
     pages = {23--25},
     publisher = {mathdoc},
     volume = {205},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_205_1_a4/}
}