@article{ASNSP_1976_4_3_4_553_0, author = {Andreotti, A. and Nacinovich, M.}, title = {Complexes of partial differential operators}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {553--621}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 3}, number = {4}, year = {1976}, zbl = {0334.58015}, mrnumber = {445557}, language = {en}, url = {http://archive.numdam.org/item/ASNSP_1976_4_3_4_553_0/} }