by Mallı, T., Yetkin, M.E., Özfırat, M.K., Kahraman, B.
Published in Journal of African earth sciences (1994) (01.10.2017)

by Ozfirat, M.K
Published in Journal of mining science (01.05.2012)

by Yetkin, Mustafa Emre, Simsir, Ferhan, Ozfirat, Muharrem Kemal, Ozfirat, Pınar Mızrak, Yenice, Hayati
Published in South African journal of industrial engineering (01.05.2016)

by Simsir, F., O:zfirat, M. K.
Published in Journal of mining science (01.07.2010)