@article{SEDP_1975-1976____A20_0,
     author = {Grigis, A.},
     title = {Caract\'erisation d'op\'erateurs pseudodiff\'erentiels et applications (d'apr\`es {R.} {Beals)}},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:19},
     pages = {1--12},
     year = {1975-1976},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     zbl = {0342.35057},
     language = {fr},
     url = {https://www.numdam.org/item/SEDP_1975-1976____A20_0/}
}