Lillian Parrot has worked on these vocatives, see Harvard Studies in Slavic Linguistics, ed. by Olga T. Yokoyama, vol. II or III. On Thu, 21 Nov 1996, Grace Fielder wrote: > A graduate student of mine (not yet subscribed to SEELANGS) is interested > in references for the colloquial Russian vocative forms such as Mash, Van'.