1. Aksoy A. Özgen M. G. and Baykal O. (1986). “A sample project of island leveling and triangulation net.” ITU Tech. Rep. Istanbul Technical Univ. Istanbul Turkey (in Turkish).
2. Refraction in leveling: Its variation with ground slope and meteorological conditions.;Angus-Leppan P. V.;Austral. J. Geodesy, Photogram. Survey,1979
3. Error sources in precise leveling.;Banger G.;Journal of Forest Faculty,1981
4. Baykal O. (1989a). “Evaluation of precise leveling measurements.” ITU MSc notes Istanbul Technical Univ. Istanbul Turkey in press.
5. Baykal O. (1989b). “Height measurements.” ITU MSc notes Istanbul Technical Univ. Istanbul Turkey in press.