References 吴崇试,《数学物理方法》,第21章 梁昆淼,《数学物理方法》,§15.1 学物理方Isoperimetric Problem (continued) Variational Formulism of Differential Equation (Approximation Method (Rayleigh-Ritz) References ÇÂÁ§5êÆÔn{6§121Ù ù&§5êÆÔn{6§§15.1 nÎ!X1Á§5êÆÔn{6§115Ù C. S. Wu 1lù C©{ÐÚ