Kyeong Soo KimSanghyuk LeeEng Gee LimEnergy-Efficient Time Synchronization Based on Asynchronous Source Clock Frequency Recovery and Reverse Two-Way Message Exchanges in Wireless Sensor Networks.347-359201765IEEE Trans. Commun.1https://doi.org/10.1109/TCOMM.2016.2626281db/journals/tcom/tcom65.html#KimLL17