There is an OAI interface through which you can retrieve documents from the server.

The base address is http://Forschungsdaten.fu-berlin.de/oai 

Typically, you can send a request modelled on the following sample to the server:

https://refubium.fu-berlin.de/oai/request?verb=ListRecords&metadataPrefix=oai_dc&set=col_fub188_14&from=2018-06-09&to=2018-06-15

Please note that you cannot use calendar dates before 7 June 2018. These values are currently defined for the metadataPrefix parameter: oai_dc