@article{RSMUP_1987__77__37_0, author = {Perotti, Alessandro}, title = {Extension of $CR$-forms and related problems}, journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova}, pages = {37--55}, publisher = {Seminario Matematico of the University of Padua}, volume = {77}, year = {1987}, mrnumber = {904611}, zbl = {0625.32013}, language = {en}, url = {http://www.numdam.org/item/RSMUP_1987__77__37_0/} }