@article{SEDP_1971-1972____A13_0,
     author = {Unterberger, A.},
     title = {Probl\`emes de convexit\'e pour les op\'erateurs diff\'erentiels \`a coefficients constants},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:13},
     pages = {1--8},
     year = {1971-1972},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     mrnumber = {477411},
     zbl = {0242.35009},
     language = {fr},
     url = {https://www.numdam.org/item/SEDP_1971-1972____A13_0/}
}