@article{ASNSP_1979_4_6_4_561_0, author = {Lewy, Hans}, title = {An inversion of the obstacle problem and its explicit solution}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {561--571}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 6}, number = {4}, year = {1979}, mrnumber = {563334}, zbl = {0428.35080}, language = {en}, url = {http://archive.numdam.org/item/ASNSP_1979_4_6_4_561_0/} }