Lalita Gupta and  R. P. Singh,  Array Signal Processing: DOA Estimation for Missing Sensors.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2011, vol. 51(3). 303 - 306
    [viewed 26 January 2020]. Available from: https://publications.waset.org/pdf/2369.