00412nam a2200133 a 450000500170000008200170001710000230003424500800005725000160013726000360015330000300018949000400021970000190025920251203090503.0  a510,bD, guc  aGuckenheimer, John  aNonlinear oscillations, dynamical systems and bifurcations of vector fields  aIst rev.ed.  aNew YorkbSpringer-Verlagc1983  axiii, 459p 206ill, 23 cm.  aApplied mathematical sciencesav.42  aHolmes, Philip