@incollection{AST_1981__89-90__85_0,
     author = {Tartakoff, D. S.},
     title = {Elementary proofs of analytic hypoellipticity for $\square_b$ and the $\overline \partial$ - {Neumann} problem},
     booktitle = {Analytic solutions of partial differential equations - Trento, 1981},
     series = {Ast\'erisque},
     pages = {85--116},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {89-90},
     year = {1981},
     mrnumber = {666404},
     zbl = {0497.35023},
     language = {en},
     url = {http://www.numdam.org/item/AST_1981__89-90__85_0/}
}