- SocialCom/PASSAT, page 1041-1047. IEEE, (2011)
- SEKE, page 392-397. Knowledge Systems Institute Graduate School, (2011)
- HASE, page 182-187. IEEE Computer Society, (2011)
- CoRR (2011)
- EuroPLoP, page 829-850. UVK - Universitaetsverlag Konstanz, (2003)
- EuroPLoP, page 469-488. UVK - Universitaetsverlag Konstanz, (2004)
- i-com 10(2):26-33 (2011)
- page 255-+. (2010)
- INTERACT 3, volume 6948 of Lecture Notes in Computer Science, page 373-390. Springer, (2011)
- EGOVIS, volume 6866 of Lecture Notes in Computer Science, page 56-67. Springer, (2011)
- IEEE Pervasive Computing 8(1):54-57 (2009)
- GI Jahrestagung, volume 19 of LNI, page 833-843. GI, (2002)
- IPTComm, page 101-110. ACM, (2010)
- J. Location Based Services 5(1):38-57 (2011)
- Pearson Studium, (2004)
- Vom Projekt zum Produkt, volume 178 of LNI, page 61-78. GI, (2010)
- EuroPKI, volume 6391 of Lecture Notes in Computer Science, page 114-129. Springer, (2009)
- SERA, page 64-71. IEEE Computer Society, (2009)
- SERA, page 135-139. IEEE Computer Society, (2009)
- MSR, page 90-93. IEEE, (2010)


author