1. Fu, K.S.: Syntactic Methods in Pattern Recognition. Academic Press, New York 1974
2. Winkler, G.: Bildbeschreibungssprachen — Was sie sind und was sie leisten. In Triendl, E. (Ed.): 1. DAGM-Symposium Bildverarbeitung und Mustererkennung, Informatik-Fachberichte 17, Sprinqer Verlag, Berlin 1978, S.107–125
3. Duda, R.O.; Hart, P.E.; Nilsson, N.J.; Sutherland, G.L.: Semantic Network Representations in Rule-Based Inference Systems. Technical Note 136, Artificial Intelligence Center, Stanford Research Inst., Menlo Park 1977
4. Brayer, J.M.; Fu, K.S.: Web Grammars and their Application to Pattern Recognition. TR-EE 75–1, Purdue University, West Lafayette 1975
5. Fu, K.S.; Booth, T.L.: Grammatical Inference — Introduction and Survey I, II. IEEE Transactions on Systems, Man and Cybernetics 5 (1975), S.95–111 und 409–423