@article{DAN_1973_213_5_a11,
     author = {G. A. Stepanyantz and B. M. Shamrikov},
     title = {The existence of optimal {Ljapunov} functions of dynamical systems},
     journal = {Doklady Akademii Nauk},
     pages = {1040--1042},
     publisher = {mathdoc},
     volume = {213},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_5_a11/}
}