@article{DAN_1985_280_5_a0,
     author = {A. V. Arutyunov},
     title = {On necessary conditions for optimality in a problem with phase},
     journal = {Doklady Akademii Nauk},
     pages = {1033--1037},
     publisher = {mathdoc},
     volume = {280},
     number = {5},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_280_5_a0/}
}