@article{DAN_1979_244_2_a1,
     author = {B. S. Darhovsky and E. S. Levitin},
     title = {Quadratic optimality conditions for a class of nonsmooth problems of mathematical programming},
     journal = {Doklady Akademii Nauk},
     pages = {270--273},
     publisher = {mathdoc},
     volume = {244},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_244_2_a1/}
}