[1] Tai,Chen-to,Unified definition for divergence,rotation and gradient,Appl.Math.& Mech.,7 1(1986),1-6.
[2] Li Guo-ping and Guo You-zhong,General Relative Quantum Field Theory.Hubei People’s Press(1981).(in Chinese).
[3] Guo Zhong-heng,Nonlinear Elastic Theory.Science Press(1981).(in Chinese).
[4] Handers,H.,Differential Forms(Revised ed.).Academic Press(1983).
[5] Guo You-zhong and Chen Yin-tong,Exterior differential and its application,Handbook of Modern Engineering Mathematics,vol.3,Chap.47(1986).(in Chinese).
[6] Guo You-zhong, Complementary variational principle in elasto-plastic theory,Kexue Tongbao,23(1983),1435-1439.
[7] Chien Wei-zang,More general generalized variational principle and higher order Lagrange multiplier method in elastic theory.Appl.Math.& Mech.,4 2(1983),137-150.
[8] Vainberg,M.M.,Variational Method and Method of Monotone Operators in the Theory of Nonlinear Equations,Wiley,New York(1973).
[9] Zienkiewicz,O.C.,The Finite Element Method,McGraw-Hill Book Company,New York(1977).
[10] Deschamps,G.A.,Electromagnetics and differential forms,proceedings of the IEEE,69 6(1981),676-696.