@article{DAN_1993_331_3_a4,
     author = {F. Clarke and Yu. S. Ledyaev},
     title = {New formulas for finite increments},
     journal = {Doklady Akademii Nauk},
     pages = {275--277},
     publisher = {mathdoc},
     volume = {331},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_3_a4/}
}