Bassam Atieh Rajabi and  Sai Peck Lee,  Change Management in Business Process Modeling Based on Object Oriented Petri Net.   journal   = {International Journal of Industrial and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2009, vol. 26(2). 151 - 156
    [viewed 25 February 2020]. Available from: https://publications.waset.org/pdf/9169.