TY  - JOUR
AU  - Arnold, André
TI  - The $\mu $-calculus alternation-depth hierarchy is strict on binary trees
JO  - RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
PY  - 1999
SP  - 329
EP  - 339
VL  - 33
IS  - 4-5
PB  - EDP-Sciences
UR  - http://archive.numdam.org/item/ITA_1999__33_4-5_329_0/
LA  - en
ID  - ITA_1999__33_4-5_329_0
ER  -