Gumperz & Wilson, R. 1971. "Convergence and Creolization : A Case From the Indo-Aryan/Dravidian Border in India." In Pidginization and Creolization of Languages, pp. 151-67. Edited by Dell H. Hymes. London : Cambridge University Press. Reprinted in LSG, pp. 251-73.
Had to do with a town with the pseudonym of 'Kupwar' in which Marathi, Kannada and Urdu were spoken, with much convergence of structure, but not of lexicon. This kind of convergence now known as 'Kupwarization.'