Paulino, Glaucio H, and Yong Liu. 2001. “Implicit Consistent and Continuum Tangent Operators in Elastoplastic Boundary Element Formulations”. Computer Methods in Applied Mechanics and Engineering 190. Elsevier: 2157–2179.

Liu, Yong, Glaucio H Paulino, and Lihua Liang. 2000. “Elasto-Viscoplastic Consistent Tangent Operator Concept-Based Implicit Boundary Element Methods”. Science in China Series E: Technological Sciences 43. Springer: 154–164.