共 50 条
- [33] NEUMANN PROBLEMS FOR 2ND-ORDER ORDINARY DIFFERENTIAL-EQUATIONS ACROSS RESONANCE [J]. ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK, 1995, 46 (03): : 393 - 406
- [37] CONTACT SYMMETRIES OF GENERAL LINEAR 2ND-ORDER ORDINARY DIFFERENTIAL-EQUATIONS [J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1983, 16 (13): : L455 - L460