Mehrnaz Najafi and Hassan Haghighi, Refinement of Object-Z Specifications Using Morgan-s Refinement Calculus. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2011, vol. 59(11). 1347 - 1356 [viewed 23 September 2024]. Available from: https://publications.waset.org/pdf/2100.