@article{INTF_1990_63_a1,
     author = {S. Z. Levendorskii and B. P. Paneah},
     title = {Degenerate elliptic equations and boundary value problems},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya },
     pages = {131--200},
     publisher = {mathdoc},
     volume = {63},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTF_1990_63_a1/}
}