Strabon: A Semantic Geospatial DBMS
Representation and Querying of Valid Time of Triples in Linked Geospatial Data
Nature of Geographic Information: An Open Geospatial Textbook
Geographic Information System Basics
Information Systems
Mathematics for Computer Science
Bringing (Web) Databases to the Masses
Mathematics for Computer Science
Access to Knowledge in the Age of Intellectual Property
The Open Digital Archaeology Textbook