Arijit Roy and  Sharmistha Roy and  Dibyendu Chatterjee ,  A Simple Electronic Curvy Length Measurement System: Application to Geography.   journal   = {International Journal of Civil and Architectural Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 692 - 696
    [viewed 12 April 2021]. Available from: https://publications.waset.org/pdf/9998015.