@article{DAN_1988_299_6_a11,
     author = {A. N. Tikhonov and A. A. Egorushkin and N. B. Zyabrev},
     title = {A multifactor optimal planning problem with decreasing cost},
     journal = {Doklady Akademii Nauk},
     pages = {1329--1332},
     publisher = {mathdoc},
     volume = {299},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_299_6_a11/}
}