?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Razali%2C+R&rft.aulast=Razali&rft.aufirst=R&rft.date=November+2007&rft.title=Comprehensibility+of+UML-based+Formal+Model+%3F+A+Series+of+Controlled+Experiments&rft.genre=proceeding