Leinen, Stefan ; Groten, Erwin ; Ayan, T. (2000):
The Combined Use of GPS and Levelling for Deformation Monitoring - Experiences from a Large Highway Viaduct.
Proceedings of the Ninth International Symposium on Recent Crustal Movements, Cairo, Egypt, November 1998, Vol. 2, P. 520-532, [Conference or Workshop Item]

Leinen, Stefan ; Groten, Erwin ; Ayan, T. ; Alanko, G. ; Celik, R. ; Denli, H. ; Özlüdemir, T. ; Erol, S. (1999):
Deformation monitoring of Karasu Viaduct with GPS and levelling.
In: Turkish-German Joint Geodetic Days <3, 1999, Istanbul>: Proceedings. Hrsg.: M. O. Altan, L. Gründig. Vol. 1. S. 61-70, [Conference or Workshop Item]

Groten, Erwin ; Leinen, S. ; Ayan, T. (1998):
Deformation Monitoring around a Large Viaduct close to Istanbul using GPS and Levelling.
In: Proceedings of Symposium Geodynamics of the Alps-Adria Area, 28.9.-2.10.1998, Dubrovnik, Croatia, [Conference or Workshop Item]

Ayan, T. ; Celik, R. ; Alanko, G. ; Denli, H. ; Özlüdemir, T. ; Leinen, S. ; Traiser, J. ; Groten, E. (1997):
Die ersten Ergebnisse der Deformationsmessungen mit GPS auf dem Karasu-Viadukt.
In: Proceedings of Second Turkish-German Joint Geodetic Days, 2nd Turkish-German Joint Geodetic Days, Berlin, Germany, 28.-30.05.1997, [Conference or Workshop Item]