@article{DE_1998_34_8_a1,
     author = {A. S. Antipin},
     title = {The differential controlled gradient method for symmetric extremal mappings},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1018--1028},
     publisher = {mathdoc},
     volume = {34},
     number = {8},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_8_a1/}
}