@article{DAN_1989_305_4_a1,
     author = {M. I. Kanovich},
     title = {Semantics and logic of computational problems},
     journal = {Doklady Akademii Nauk},
     pages = {778--782},
     publisher = {mathdoc},
     volume = {305},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a1/}
}