@article{FAA_1993_27_3_a5,
     author = {L. E. Positsel'skii},
     title = {Nonhomogeneous {Quadratic} {Duality} and {Curvature}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {57--66},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1993_27_3_a5/}
}