@article{SEDP_1972-1973____A23_0,
     author = {Treves, F.},
     title = {Existence et r\'egularit\'e des solutions des \'equations aux d\'eriv\'ees partielles lin\'eaires. {Quelques} r\'esultats et quelques probl\`emes ouverts},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:22},
     pages = {1--21},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1972-1973},
     mrnumber = {399627},
     zbl = {0272.35062},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1972-1973____A23_0/}
}