@article{SM_2003_194_2_a4,
     author = {A. A. Milyutin},
     title = {Strengthening the~conditions of {Clarke} and {Smirnov
}},
     journal = {Sbornik. Mathematics},
     pages = {251--280},
     publisher = {mathdoc},
     volume = {194},
     number = {2},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_2_a4/}
}