@article{ZNSL_1992_201_a5,
     author = {A. Yu. Solynin},
     title = {Boundary distortions and change of module under extension of a doubly connected domain},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {157--163},
     year = {1992},
     volume = {201},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1992_201_a5/}
}