@article{MAT_1965_9_5_a3,
     author = {T. Yoshizawa},
     title = {Liapunov's function and boundedness of solutions},
     journal = {Matematika},
     pages = {95--127},
     year = {1965},
     volume = {9},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1965_9_5_a3/}
}