@article{1028998975, author = {Eggan, L. C.}, title = {Transition graphs and the star-height of regular events.}, journal = {Michigan Math. J.}, volume = {10}, number = {1}, year = {1963}, pages = { 385-397}, language = {en}, url = {http://dml.mathdoc.fr/item/1028998975} }
Eggan, L. C. Transition graphs and the star-height of regular events.. Michigan Math. J., Tome 10 (1963) no. 1, pp. 385-397. http://gdmltest.u-ga.fr/item/1028998975/