@article{VMJ_2005_7_4_a6,
     author = {G. G. Magaril-Il'yaev},
     title = {The {Lagrange} principle for smooth problems with constraints on a cone},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {38--45},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2005_7_4_a6/}
}