Thomas Meier,  Introduction of an Approach of Complex Virtual Devices to Achieve Device Interoperability in Smart Building Systems.   journal   = {International Journal of Urban and Civil Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2018, vol. 138(6). 604 - 611
    [viewed 23 September 2020]. Available from: https://publications.waset.org/pdf/10009100.