لطفاً :
A numerical approach to the complete stress-strain curve of concrete
Sandor Popovics
Cement and Concrete Research
Volume 3, Issue 5, September 1973, Pages 583–599
http://www.sciencedirect.com/science/article/pii/0008884673900963
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http://www.concrete.org/PUBS/JOURNAL...s.asp?ID=10922
http://www.concrete.org/PUBS/JOURNAL...ls.asp?ID=2844
http://www.concrete.org/PUBS/JOURNAL...ome=JP&ID=7997
http://www.concrete.org/PUBS/JOURNAL...ome=JP&ID=6914...