References
- R. BRYANT and P. GRIFFITHS, Characteristic cohomology of differential systems I, General theory, Jour. Amer. Math. Soc. (8) (1995), 507-597
- R. BRYANT and P. GRIFFITHS, Characteristic cohomology of differential systems II, Conservation laws for a class of parabolic equations, Duke Math. J. 78 (1995), 531-676. https://doi.org/10.1215/S0012-7094-95-07824-7
- E. NOETHER, Invariante Variationsprobleme, Nachr. Konig. Gesell. Wissen. Gottingen, Math.-phys. Kl. (1918), 235-257. (발표 3년후 출판됨.) English translation: Transport Theory and Stat. Phys. (1) (1971), 186-207.
- P. Olver, Applications of Lie Groups to Differential Equations, 2nd Ed. Springer-Verlag, 1993.
- S.-H. WANG, Conservation laws from EDS point of view, Seoul N. Univ. Lecture-note, 2007.