Zhi Zong Khin Yong Lam Yingyan Zhang A multidomain Differential Quadrature approach to plane elastic problems with material discontinuity. 539-553 2005 41 Math. Comput. Model. 4-5 https://doi.org/10.1016/j.mcm.2003.11.009 db/journals/mcm/mcm41.html#ZongLZ05