S . s . rao , “ the finite element method in engineering ” , pergamon press , 2002 《有限单元法》王勖成编著，清华大学出版社， 2003 。
2.
On the basis of analyzing on the different opinions about the origin of the classification of the four branches and its related historical materials , this paper thinks the classification of the four branches originates from xun xu ' s zhong jing xin bu 摘要在列举并分析四部分类法起源的不同观点之基础上，通过深入分析相关史料，认为四部分类法源于荀勖之《中经新薄》 。
