@article{BSMF_1990__118_2_147_0, author = {Xu, Chao-Jiang}, title = {Subelliptic variational problems}, journal = {Bulletin de la Soci\'et\'e Math\'ematique de France}, volume = {118}, year = {1990}, pages = {147-169}, doi = {10.24033/bsmf.2141}, mrnumber = {92b:49008}, zbl = {0717.49004}, language = {en}, url = {http://dml.mathdoc.fr/item/BSMF_1990__118_2_147_0} }
Xu, Chao-Jiang. Subelliptic variational problems. Bulletin de la Société Mathématique de France, Tome 118 (1990) pp. 147-169. doi : 10.24033/bsmf.2141. http://gdmltest.u-ga.fr/item/BSMF_1990__118_2_147_0/
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