1. Aydan Ö (2012) The inference of physico-mechanical properties of soft rocks and the evaluation of the effect of water content and weathering on their mechanical properties from needle penetration tests. Symposium of ARMA, Chicago, Paper No. ARMA12-639 (on CD)
2. Aydan Ö, Ulusay R (2003) Geotechnical and geoenvironmental characteristics of man-made underground structures in Cappadocia, Turkey. Eng Geol 69:245–272
3. Aydan Ö, Ulusay R (2013) Geomechanical evaluation of Derinkuyu Antique underground City and its implications in geoengineering. Rock Mech Rock Eng 46:731–754
4. Aydan Ö, Seiki T, Ito T, Ulusay R, Yüzer E (2006) A comparative study on engineering properties of tuffs from Cappadocia of Turkey and Oya of Japan. In: Proceedings of the Symposium on Modern Applications of Engineering Geology, Turkish National Group of Engineering Geology, Denizli, pp 425–433
5. Aydan Ö, Watanabe S, Tokashiki N (2008) The inference of mechanical properties of rocks from penetration tests. In: Majdi A, Ghazvinian A (eds) Proceedings of the 5th Asian Rock Mechanics Symposium (ARMS5), Tehran, Iran, vol 1, pp 213–220