@article{PDML_1993___2_A1_0,
     author = {Hacque, Michel},
     title = {Extensions $\mathrm {Q}$-normales},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {1--85},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     number = {2},
     year = {1993},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1993___2_A1_0/}
}