?url_ver=Z39.88-2004&rft_id=10.7227%2FIJMEE.39.4.2&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=El-Harbawi%2C+M.&rft.aulast=El-Harbawi&rft.aufirst=M.&rft.date=2011&rft.issn=03064190&rft.title=International+Journal+of+Mechanical+Engineering+Education&rft.pages=291-296&rft.atitle=Development+of+educational+software+for+designing+shell-and-tube+heat+exchangers&rft.issue=4&rft.volume=39&rft.genre=article