相圖 (動態系統)edu/courses/18-03-differential-equations-spring-2010/resources/mit18_03s10_chapter_26/) Jordan, D. W.; Smith, P. Nonlinear Ordinary Differential Equations fourth
非线性偏微分方程Inna Shingareva Carlos Lizarrga Celaya, Solving Nonlinear Partial Differential Equations with Maple and Mathematica, Springer, ISBN 9783709105160 *谷超豪