@article{SM_1991_69_2_a1,
     author = {Yu. S. \`Emanuilov},
     title = {Existence theorems for control problems of singular systems with distributed parameters},
     journal = {Sbornik. Mathematics},
     pages = {341--355},
     year = {1991},
     volume = {69},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1991_69_2_a1/}
}