Jung-Min Yang,  On Fault Diagnosis of Asynchronous Sequential Machines with Parallel Composition.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2017, vol. 129(9). 997 - 1000
    [viewed 06 July 2020]. Available from: https://publications.waset.org/pdf/10007853.