D. Björner. Int. Computing Symp., North-Holland, Amsterdam, See also: report ID673, Department of Comp. Sc., Tech. University
of Denmark, Lyngby (1977)..(April 1977)
D. Coleman, J. Hugues, and M. Powell. Institute of Electrical and Electronics Engineers. Transactions on
Software Engineering, SE-7 (2):
189--196(1981)
D. Knuth. Attribute Grammars and their Applications (WAGA), volume 461 of Lecture Notes in Computer Science, Springer-Verlag, New York--Heidelberg--Berlin, Paris.(September 1990)