00422nam a2200133 a 450000500170000008200190001710000060003611000160004224500530005826000360011130000220014749000410016950000780021020251203091008.0  a510.8,bD, geo  d_  aMartini, R.  aGeometrical approaches to differential equations  aNew YorkbSpringer-Verlagc1980  avii, 339p6c22 cm.  aLecture notes in mathematicsdv. 810  aScheveningen conference on differential equations(4th: 1979: Netherlands)