Xie, M., X. Liu, T. Esaki, Z. Wang, and J. Huang. “Three-Dimensional Critical Slip Surface Identification and Slope Stability Assessment of 11# Lava Lobe of Unzen Volcano, Japan”. Italian Journal of Engineering Geology and Environment, Nov. 2011, pp. 1023-30, doi:10.4408/IJEGE.2011-03.B-111.