@article{DAN_1963_151_1_a10,
     author = {I. Petersen},
     title = {Convergence of gradient methods for finding a local conditional minimum of a non-linear functional 
},
     journal = {Doklady Akademii Nauk},
     pages = {45--47},
     publisher = {mathdoc},
     volume = {151},
     number = {1},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a10/}
}