Haptačahaptāitiš: Festschrift for Fridrik Thordarson. — Ed. by Dag Haug. — Oslo: Instituttet for sammenlignende kulturforskning. — (Instituttet for sammenlignende kulturforskning, Serie B : Skrifter, 116). — P. 191-204.
An attempt to set up a chronological table of most of the changes occurring from Proto-Indo-European to classical Armenian.