@article{DIA_1989__22__7_0,
     author = {Lafont, Yves},
     title = {Primitive recursive categories and machines},
     journal = {Diagrammes},
     pages = {7--13},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {22},
     year = {1989},
     mrnumber = {1059267},
     zbl = {0702.18003},
     language = {en},
     url = {http://www.numdam.org/item/DIA_1989__22__7_0/}
}