@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/