Obote, S., & Kagoshima, K. (2003). Estimation of frequency offset in QPSK demodulation. Electronics & Communications in Japan, Part 3: Fundamental Electronic Science, 86(9), 1. https://doi.org/10.1002/ecjc.10089
Chicago Style (17th ed.) CitationObote, Shigeki, and Kenichi Kagoshima. "Estimation of Frequency Offset in QPSK Demodulation." Electronics & Communications in Japan, Part 3: Fundamental Electronic Science 86, no. 9 (2003): 1. https://doi.org/10.1002/ecjc.10089.
MLA (9th ed.) CitationObote, Shigeki, and Kenichi Kagoshima. "Estimation of Frequency Offset in QPSK Demodulation." Electronics & Communications in Japan, Part 3: Fundamental Electronic Science, vol. 86, no. 9, 2003, p. 1, https://doi.org/10.1002/ecjc.10089.
Warning: These citations may not always be 100% accurate.