@article{MT_1987_7_a5,
     author = {S. K. Vodopyanov},
     title = {Geometric properties of domains and mappings. {Lower} bounds on the norm of the extension operator},
     journal = {Matemati\v{c}eskie trudy},
     pages = {70--101},
     year = {1987},
     volume = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1987_7_a5/}
}