@article{DAN_1990_312_5_a6,
     author = {S. V. Emel'yanov and P. V. Zhivoglyadov and S. K. Korovin and S. V. Nikitin},
     title = {A semigroup approach to problems of describing a class of},
     journal = {Doklady Akademii Nauk},
     pages = {1057--1061},
     publisher = {mathdoc},
     volume = {312},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_5_a6/}
}