Luga, E., Paja, A. and Atis, C.D. 2017. AN INVESTIGATION ON THE PARTIAL REPLACEMENT OF PORTLAND CEMENT WITH KOSOVO FLY ASH IN CEMENT MORTARS . MATTER: International Journal of Science and Technology. 3, 3 (Nov. 2017), 125–141. DOI:https://doi.org/10.20319/mijst.2017.33.125141.