KOÇKAR, M. K. And AKGÜN, H. 2005. Tunnel and portal stability assessment in weak rock. Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress , (İstanbul, Turkey), 149-155.

KOÇKAR, M. K., & AKGÜN, H., (2005). Tunnel and portal stability assessment in weak rock . Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress (pp.149-155). İstanbul, Turkey

KOÇKAR, MUSTAFA, And HALUK AKGÜN. "Tunnel and portal stability assessment in weak rock," Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress, İstanbul, Turkey, 2005

KOÇKAR, MUSTAFA K. And AKGÜN, HALUK. "Tunnel and portal stability assessment in weak rock." Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress , İstanbul, Turkey, pp.149-155, 2005

KOÇKAR, M. K. And AKGÜN, H. (2005) . "Tunnel and portal stability assessment in weak rock." Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress , İstanbul, Turkey, pp.149-155.

@conferencepaper{conferencepaper, author={MUSTAFA KEREM KOÇKAR And author={HALUK AKGÜN}, title={Tunnel and portal stability assessment in weak rock}, congress name={Underground Space Use: Analysis of the Past and Lessons for the Future - Proceedings of the 31st ITA-AITES World Tunneling Congress}, city={İstanbul}, country={Turkey}, year={2005}, pages={149-155} }