Why is Slavic < č> not always /tʃ/?

Author(s) Zygis, Marzena
Date of publication 2011
Compilation title Proceedings of the XVIIth International Congress of Phonetic Sciences
Editor(s) Wai-Sum Lee & Eric Zee (eds.)
Pages 2340-2343
Publisher Department of Chinese, Translation and Linguistics, University of Hong-Kong
Place Hong Kong