@article{SM_1987_58_1_a4,
     author = {V. E. Slyusarchuk},
     title = {Invertibility of nonautonomous functional-differential operators},
     journal = {Sbornik. Mathematics},
     pages = {83--100},
     year = {1987},
     volume = {58},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_58_1_a4/}
}