@article{KUIPM_1973_1_1_a14,
     author = {Ya. I. Zabotin and A. I. Korablev and R. F. Khabibullin},
     title = {Sufficient conditions for a global minimum in a nonlinear programming problem},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {103--108},
     year = {1973},
     volume = {1},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1973_1_1_a14/}
}