Hittite and the Indo-European Verb by Jay H. Jasanoff

The "disconnects" between Hittite and the other early Indo-European languages have been extensively explored, and scholars have realized that the conventional picture of the parent language must be modified to account for the facts of Hittite. Jay Jasanoff proposes the most thorough and systematic resolution of the problem yet published, putting forth a revolutionary model of the Proto-Indo-European verbal system