@article{PDML_1977__14_2_41_0,
     author = {Fraisse, R.},
     title = {Deux relations d\'enombrables, logiquement \'equivalentes pour le second ordre, sont isomorphes},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {41--62},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     volume = {14},
     number = {2},
     year = {1977},
     mrnumber = {535746},
     zbl = {0397.03008},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1977__14_2_41_0/}
}