TY - Journal of Yangtze River Scientific Research Institute A1 - HE Yu-hong T1 - Upper Bound Finite Element of Slope Analysis Based onOptimal Square Polygon Approximation Y1 - 2015-08-20 JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 84 EP - 88 VL - 32 IS - 8 UR - http://ckyyb.crsri.cn N1 - 10.3969/j.issn.1001-5485.2015.08.015 ER -