@article{DAN_1984_275_6_a5,
     author = {K. V. Kim and Yu. E. Nesterov and B. V. Cherkasskii},
     title = {An estimate of the effort in computing the gradient},
     journal = {Doklady Akademii Nauk},
     pages = {1306--1309},
     publisher = {mathdoc},
     volume = {275},
     number = {6},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_6_a5/}
}