I'm writing in the hope that someone may have a scan of the following article that they're willing to share:

George-Jean Pinault (1985) "Emploi et analyse des adverbes comparatifs sanskrits en -vát", in B. Schlerath (ed.) Grammatische Kategorien: Funktion und Geschichte. Wiesbaden: Reichert, 340-369.

Many thanks!

Robert