@article{DAN_1965_163_1_a4,
     author = {R. I. Zarosskii},
     title = {On the problem of necessary and sufficient conditions for an absolute minimum},
     journal = {Doklady Akademii Nauk},
     pages = {26--29},
     publisher = {mathdoc},
     volume = {163},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_163_1_a4/}
}