@article{ITA_1999__33_4-5_329_0, author = {Arnold, Andr\'e}, title = {The $\mu $-calculus alternation-depth hierarchy is strict on binary trees}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {33}, year = {1999}, pages = {329-339}, mrnumber = {1748659}, zbl = {0945.68118}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_1999__33_4-5_329_0} }
Arnold, André. The $\mu $-calculus alternation-depth hierarchy is strict on binary trees. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 33 (1999) pp. 329-339. http://gdmltest.u-ga.fr/item/ITA_1999__33_4-5_329_0/
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