共 10 条
- [4] COHEN DS, TO BE PUBLISHED
- [5] Cole J. D., 1968, PERTURBATION METHODS
- [6] KELLER HB, TO BE PUBLISHED
- [8] Protter MH., 1984, MAXIMUM PRINCIPLES D, DOI [10.1007/978-1-4612-5282-5, DOI 10.1007/978-1-4612-5282-5]
- [10] SIMPSON RL, TO BE PUBLISHED