@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/}
}