@article{DAN_1977_232_4_a9,
     author = {S. S. Kutateladze},
     title = {Formulas for the computation of subdifferentials},
     journal = {Doklady Akademii Nauk},
     pages = {770--772},
     publisher = {mathdoc},
     volume = {232},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_232_4_a9/}
}