M. KUMAR, F. KHALID, R. AFREEN, and S. LODI. “Gross and Yield Period of Vibration of Low-Rise Reinforced Concrete Frames in Karachi ”. Sindh University Research Journal - SURJ (Science Series), Vol. 49, no. 3, Sept. 2017, doi:10.26692/surj.v49i3.1498.