Retrieval of precipitable water vapor by using combined GPS/BDS/GLONASS/Galileo PPP method
LI Hongda, ZHANG Xianyun, LIAO Liufeng, LI Ting, NIE Shihai
Bulletin of Surveying and Mapping . 2020, (6): 63 -66,98 .  DOI: 10.13474/j.cnki.11-2246.2020.0182