@article{SEDP_1970-1971____A30_0,
     author = {Wilcox, C. H.},
     title = {A coerciveness inequality for a class of nonelliptic operators and its applications},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:30},
     pages = {1--10},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1970-1971},
     mrnumber = {410053},
     zbl = {0235.35014},
     language = {en},
     url = {http://archive.numdam.org/item/SEDP_1970-1971____A30_0/}
}