Hello all
The main importat site is:
site1:"www.cs.utexas.edu/~novak/cs375contents.html"
Another sites for building tree:
site2:"www.csse.monash.edu.au/~lloyd/tildeProgLang/Grammar"
site3:"www.csse.monash.edu.au/~lloyd/tildeProgLang/C/Tree/Postfix.c"
site4:en.wikipedia.org/wiki/Intermediate_language
best wishes