@article{IM2_1998_62_5_a4,
     author = {V. S. Klimov},
     title = {Topological characteristics of non-smooth functionals},
     journal = {Izvestiya. Mathematics},
     pages = {969--984},
     year = {1998},
     volume = {62},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1998_62_5_a4/}
}