Mathematics for sentence composition?

Hi all, This is a request for information from those with knowledge of computational linguistics and related things. Sentence structure is a long-established field, most notably with major contributions by Lambek, and concerns how words compose within a sentence. How much ( is known / has been done ) in mathematical terms on composing sentences in order to form stories? Im am working on something, don’t want to re-invent the wheel, and also want to use/credit what has been done before. Cheers, Bob. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]