@article{SEDP_1970-1971____A22_0,
     author = {Bolley, P. and Camus, J.},
     title = {Une classification de probl\`emes elliptiques d\'eg\'en\'er\'es \`a une ou plusieurs variables},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:22},
     pages = {1--16},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1970-1971},
     mrnumber = {393837},
     zbl = {0247.47043},
     language = {fr},
     url = {http://www.numdam.org/item/SEDP_1970-1971____A22_0/}
}