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3. Bilgin, N., Kuzu, C., Eskikaya, S., 1997. Cutting performance of rock hammers and roadheaders in Istanbul Metro drivages. In: Proceedings, Word Tunnel Congress’97, Tunnels for People, Balkema, pp. 455–460.
4. The performance prediction of impact hammers from Schmidt hammer rebound values in Istanbul metro tunnel drivages;Bilgin;Tunnelling and Underground Space Technology,2002
5. Bilgin, N., Tumac, D., Feridunoglu, C., Karakas, A.R., Akgul, M., 2005. The performance of a roadheader in high strength rock formations in Küçüksu tunnel, underground space use. In: Proceeding of the 31st ITA-AITES World Tunnel Congress, May, Istanbul, pp. 815–820.