00329nam a2200133Ia 4500008004100000020002200041082001200063082001000075100002400085245005100109260001300160260001300173260000900186230118s9999||||xx |||||||||||||| ||und||  a978-81-8489-470-7  a515.352  bBET/D  adavid    bbetounes 0adifferential equations:theory and applications  anew york  bspringer  c2001