Steven Franks & Tracy Holloway King 
Handbook of Slavic Clitics [PDF ebook] 

Clitics are grammatical elements that are treated as independent words in syntax but form a phonological unit with the word that precedes or follows it. This volume brings together the facts about clitics in the Slavic languages, where they have become a focal points of recent research. The authors draw relevant generalizations across the Slavic languages and highlight the importance of these phenomena for linguistic theory.