@article{PDML_1967__4_3_2_0,
     author = {Da Costa, Newton C. A.},
     title = {Une nouvelle hi\'erarchie de th\'eories inconsistantes},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {2--8},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     volume = {4},
     number = {3},
     year = {1967},
     mrnumber = {238688},
     zbl = {0189.28602},
     language = {fr},
     url = {http://www.numdam.org/item/PDML_1967__4_3_2_0/}
}