@article{PDML_1974__11_1_89_0,
     author = {Hacque, Michel},
     title = {Triples et exactitudes},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {89--100},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     volume = {11},
     number = {1},
     year = {1974},
     mrnumber = {401870},
     zbl = {0287.18012},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1974__11_1_89_0/}
}