@article{DAN_1983_269_3_a4,
     author = {Yu. P. Krivenkov},
     title = {Variational principles of theoretical physics in nonfree systems with geometric and kinematic constraints of nonconfining type},
     journal = {Doklady Akademii Nauk},
     pages = {536--539},
     publisher = {mathdoc},
     volume = {269},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_269_3_a4/}
}