Kavandi, P., Panji, M., Ganjian, N., & Asgari Marnani, J. "Seismic Analysis of a Semi-Sine Hill-Valley Topography Overlying a Subsurface Cavity Under Vertical P-SV Wave Propagation Using the DR-BEM", Ferdowsi Civil Engineering, 39, 1, 2026, 111-132. doi: 10.22067/jfcei.2025.92202.1343