@article{KUIPM_1988_15_15_a1,
     author = {I. Ya. Zabotin},
     title = {Subgradient method to find the saddle point of a convex-concave function},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {6--12},
     year = {1988},
     volume = {15},
     number = {15},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1988_15_15_a1/}
}