@Book{Liu2023,
author  = "Liu, Qing",
title   = "Regional gravity field refinement for geoid height modeling based on the combination of data from various observation techniques",
year    = "2023",
address = "München",
series  = "DGK: C (Dissertationen)",
volume  = "Heft Nr. 896",
url     = "https://publikationen.badw.de/de/048812873",
}