Żygis, Marzena (2003) phonetic and phonological aspects of Slavic sibilant frictionives in TsA and Silke Hamann (eds) ZAS papers in linguistics 32: 175-213.
Żygis, Marzena (2003). Phonetic and Phonological Aspects of Slavic Sibilant Fricatives. In Hall, T.A. and Silke Hamann (eds). ZAS Papers in Linguistics 32: 175-213.