@article{MZM_1976_20_4_a12,
     author = {S. G. Suvorov},
     title = {On the conditional extremum of functionals with discontinuous gradients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {581--588},
     year = {1976},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_4_a12/}
}