%0 Journal Article
%A Arnold, André
%T The $\mu $-calculus alternation-depth hierarchy is strict on binary trees
%J RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
%D 1999
%P 329-339
%V 33
%N 4-5
%I EDP-Sciences
%U http://archive.numdam.org/item/ITA_1999__33_4-5_329_0/
%G en
%F ITA_1999__33_4-5_329_0