@article{1093888313,
author = {Dekker, J. C. E.},
title = {Projective bigraphs with recursive operations.},
journal = {Notre Dame J. Formal Logic},
volume = {19},
number = {1},
year = {1978},
pages = { 193-199},
language = {en},
url = {http://dml.mathdoc.fr/item/1093888313}
}
Dekker, J. C. E. Projective bigraphs with recursive operations.. Notre Dame J. Formal Logic, Tome 19 (1978) no. 1, pp. 193-199. http://gdmltest.u-ga.fr/item/1093888313/