@article{INTD_1992_40_a0,
     author = {V. M. Filippov and V. M. Savchin and S. G. Shorokhov},
     title = {Variational principles for nonpotential operators},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {3--176},
     publisher = {mathdoc},
     volume = {40},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTD_1992_40_a0/}
}