@article{IM2_1990_34_2_a4,
     author = {V. S. Klimov},
     title = {On the problem of periodic solutions of operator differential inclusions},
     journal = {Izvestiya. Mathematics},
     pages = {317--335},
     year = {1990},
     volume = {34},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_2_a4/}
}