@article{DAN_1980_253_4_a6,
     author = {V. Ya. Katkovnik and V. E. Kheisin},
     title = {A universal residual function for solving conditional extremum problems},
     journal = {Doklady Akademii Nauk},
     pages = {804--806},
     publisher = {mathdoc},
     volume = {253},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_253_4_a6/}
}