This data is licensed by the Creative Commons Attribution 4.0 Unported (CC-BY-4.0) License. You have to cite the data in the following way:
Herrmann F. (2020); TERENO data from station(s) AGIA_CK_003 with parameter(s) AirHumidity for time period 2019-12-11 to 2020-01-15; https://hdl.handle.net/20.500.11952/TERENO.AGIA_CK_003.1579174367159