D-H. Kim, A. S. Balasubramaniam, and I. Gratchev. “Application of Photogrammetry and Image Analysis for Rock Slope Investigation”. Geotechnical Engineering Journal of the SEAGS & AGSSEA, vol. 49, no. 2, Oct. 2024, pp. 49-56, doi:10.14456/seagj.2018.35.