Inessive case is a case that expresses a location within the referent of the noun it marks.
The term inessive case is used especially in Finnish grammatical studies.
(Finnish)
Lyons, John. 1968.Introduction to theoretical linguistics. Cambridge, England: Cambridge University.
Gove, Philip B. (editor). 1966.Webster's third new international dictionary of the English language. Unabridged, with seven language dictionary. Chicago: Encyclopaedia Britannica.
Crystal, David. 1985.A dictionary of linguistics and phonetics. 2nd edition. New York: Basil Blackwell.