See also: The Case for Case Reopened. In Syntax and Semantics, Vol. 8, Academic Press, 1977In E. Bach and R. Harms (Eds.), Universals in linguistic theory. New York: Holt, Rinehart, and Winston, 1-88
PhD. dissertation, Harvard University, August 1967. Reprinted as a volume in the series Outstanding Dissertations in the Computer Sciences, New York: Garland Publishing, 1979