@article{GDZPPN002287617, title = {Recursive Digraphs, Splinters and Cylinders.}, journal = {Mathematische Annalen}, volume = {137}, year = {1959}, pages = {211-218}, zbl = {0087.25103}, url = {http://dml.mathdoc.fr/item/GDZPPN002287617} }
MYHILL, J. Recursive Digraphs, Splinters and Cylinders.. Mathematische Annalen, Tome 137 (1959) pp. 211-218. http://gdmltest.u-ga.fr/item/GDZPPN002287617/