Singhal, R. K., Vavra, M., & Singhal, R. K. (1990). Mine planning and equipment selection 1990: Proceedings of the second International Symposium on mine planning and equipment selection, Calgary, Canada, 7-9 November 1990. Rotterdam: Balkema.
Παραπομπή Chicago StyleSinghal, Raj K., Marion Vavra, and Rai K. Singhal. Mine Planning and Equipment Selection 1990: Proceedings of the Second International Symposium On Mine Planning and Equipment Selection, Calgary, Canada, 7-9 November 1990. Rotterdam: Balkema, 1990.
Παραπομπή MLASinghal, Raj K., Marion Vavra, and Rai K. Singhal. Mine Planning and Equipment Selection 1990: Proceedings of the Second International Symposium On Mine Planning and Equipment Selection, Calgary, Canada, 7-9 November 1990. Rotterdam: Balkema, 1990.