SLAV L572 R.
Feldstein
Basic Reflex Handout for
Common Slavic (by Lunt)
Elkina OCS Textbook (Very
good section on Common Slavic, pp. 59-105--in Russian)
Proto-Indoeuropean
(PIE) Website
Bombard, Alan.
“Reconstructing PIE Phonology.”
or: http://www.utexas.edu/cola/depts/lrc/iedocctr/ie-ling/ie-phon-Bomhard.html
Useful Internet Links: