@article{DE_1966_2_2_a9,
     author = {W. Tung},
     title = {The heightening property of direct values of generalized potentials for the comparison function of a general elliptic operator of second order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {266--294},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_2_a9/}
}