@article{MMO_1960_9_a3,
     author = {E. F. Zhizhenkova and G. M. Zhislin},
     title = {On the existence of a minimum of certain quadratic functionals in an unbounded region},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {121--128},
     publisher = {mathdoc},
     volume = {9},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1960_9_a3/}
}