@article{TM_1981_157_a7,
     author = {P. I. Lizorkin and S. M. Nikol'skii},
     title = {Coercive properties of elliptic equations with degeneration. {Variational} method},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {90--118},
     publisher = {mathdoc},
     volume = {157},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1981_157_a7/}
}