Schmidt Karl Horst. Studien zur Rekonstruktion des Lautstandes der südkaukasischen Grundsprache

Wiesbaden: F. Steiner, 1962. — xv, 160 p. — (Abhandlungen für die Kunde des Morgenlandes, vol. 34, 3).This present study aims at a thorough comparative analysis of Georgian, Svanian, and Mingrelo-Laz, the three constituents of the Kartvelian language group. Basing himself on first-hand material and on the work of such authorities as Professor Arnold Chik'obava of the Tbilisi Institute of Linguistics, Schmidt has established a number of regular vocalic and consonantal alternances and equivalences. (https://archive.org/details/@arbomhard)