@article{SEDP_1971-1972____A26_0,
     author = {Bardos, C.},
     title = {Prolongements maximaux positifs d'op\'erateurs positifs et probl\`emes de perturbations singuli\`eres},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:26},
     pages = {1--12},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1971-1972},
     mrnumber = {397452},
     zbl = {0238.47033},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1971-1972____A26_0/}
}