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@article{PDML_1968__5_1_37_0, author = {Maury, G.}, title = {$\Sigma $-compl\'ements}, journal = {Publications du D\'epartement de math\'ematiques (Lyon)}, pages = {37--62}, publisher = {Universit\'e Claude Bernard - Lyon 1}, volume = {5}, number = {1}, year = {1968}, mrnumber = {238883}, zbl = {0164.04001}, language = {fr}, url = {http://geodesic.mathdoc.fr/item/PDML_1968__5_1_37_0/} }
Maury, G. $\Sigma $-compléments. Publications du Département de mathématiques (Lyon), Tome 5 (1968) no. 1, pp. 37-62. http://geodesic.mathdoc.fr/item/PDML_1968__5_1_37_0/