@article{SD_1964-1965__18_1_A8_0,
     author = {Fouques, Alfred},
     title = {$a$-id\'eaux, $a$-syst\`emes},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:9},
     pages = {1--8},
     year = {1964-1965},
     publisher = {Secr\'etariat math\'ematique},
     volume = {18},
     number = {1},
     zbl = {0214.26901},
     language = {fr},
     url = {https://www.numdam.org/item/SD_1964-1965__18_1_A8_0/}
}