@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://archive.numdam.org/item/PDML_1968__5_1_37_0/}
}