Omar, H. M., and N. R. Ismail. “The Suitability of Limestone from Pilaspi Formation (Middle-Late Eocene) for Building Stone in Koya Area, NE Iraq”. ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY, Vol. 3, no. 2, Sept. 2015, pp. 18-23, doi:10.14500/aro.10068.