Vyshnavi, N., and D. Rao. “AN EXPERIMENTAL INVESTIGATION ON STRENGTH PROPERTIES OF CONCRETE BY PARTIAL REPLACEMENT OF NATURAL COARSE AGGREGATE WITH FLY ASH AGGREGATE”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 4, no. 12, Dec. 2018, pp. 558-67, https://ijtimes.com/index.php/ijtimes/article/view/312.