@article{RM_1973_28_6_a14,
     author = {S. G. Gindikin},
     title = {A certain class of differential operators that admit a two-sided energy estimate},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_6_a14/}
}