M. Yousefi and  N. Nasirzadeh,  High-Efficiency Comparator for Low-Power Application.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 115(7). 849 - 852
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/10004775.