Lexical ambiguity is a fundamental problem in Information Retrieval (IR), especially in the medical domain. Many systems use a subset of the words contained in the document to represent the content, but they are faced with the problem of ambiguity.
J. Puzicha, T. Hofmann, and J. Buhmann. Computer Vision and Pattern Recognition, 1997. Proceedings., 1997
IEEE Computer Society Conf. on, page 267--272. (1997)