@article{SM_2002_193_10_a1,
     author = {O. V. Druzhinina and A. A. Shestakov},
     title = {Generalized direct {Lyapunov} method for the~analysis of stability and attraction in general time systems},
     journal = {Sbornik. Mathematics},
     pages = {1411--1441},
     year = {2002},
     volume = {193},
     number = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_10_a1/}
}