@inproceedings{SchulzGerlachBeierle2006DELFI,
    AUTHOR = "I. Schulz-Gerlach and C. Beierle",
    TITLE = "{Ein erweiterbares interaktives Online-\"{U}bungssystem mit 
              Aufgaben zu Aussagen-  und Pr\"{a}dikatenlogik}",
    BOOKTITLE = {DeLFI 2006: 4.\ e-Learning 
                 Fachtagung Informatik},
    YEAR = 2006,
    EDITORlong = {Max M\"{u}hlh\"{a}user and Guido R\"{o}\"{s}ling and 
                  Ralf Steinmetz},
    EDITOR      = {M. M\"{u}hlh\"{a}user and G. R\"{o}\"{s}ling and 
                   R. Steinmetz},
    PAGES = "243--254",
    PUBLISHER = {Gesellschaft f\"{u}r Informatik},
    ADDRESS = {Bonn},
    SERIES = {GI Lecture Notes in Informatics (LNI)},
    VOLUME = "P-88"  }