Acquired packages of electronic books (eBooks) are listed and linked in the Database Information System (DBIS), see
An overview about the available packages and the corresponding titles can be found here in German language.
Single eBooks are listed and linked in the catalogues. For example, a search query in UBfind for "dubbel" results in the following hit list:
You can get access to the eBook via the detailed representation after clicking on the respective result item.
As another example, searching the OPAC for "bauphysik" results in the following hit list:
After selecting hit no. 7 of the short list, please click on one of the two entries in "Link" to get access to the full text.