@article{PDML_1967__4_3_55_0,
     author = {Fraisse, Roland},
     title = {La classe universelle : une notion \`a la limite de la logique et de la th\'eorie des relations},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {55--61},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     volume = {4},
     number = {3},
     year = {1967},
     mrnumber = {238683},
     zbl = {0189.00802},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1967__4_3_55_0/}
}