@article{ZNSL_1987_163_a1,
     author = {M. Sh. Birman and M. Z. Solomyak},
     title = {Construction of a function of class $H^2$ with given conormal derivative in a piecewise smooth domain},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {17--28},
     publisher = {mathdoc},
     volume = {163},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_163_a1/}
}