Bhat, K.P.M., Saurabh Jogdand, Salil Malshe, and Vasundhara Kelkar. 2002. “Hardware Implementation of Pi/4-DQPSK Modem for Mobile Communication (Short Communication)”. Defence Science Journal 51 (3), 315-20. https://doi.org/10.14429/dsj.51.2245.