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								. Dragt A J. Lecture Notes on Nonlinear Orbit Dynamics, In: Carrigan R A etal. eds., Summer School on High Energy Particle Accelerators, Fermi National Accelerator Laboratory, 1981, NewYork: AIP87, 1982:147 
. Dragt A J. Lecture Notes on Nonlinear Orbit Dynamics, In: Carrigan R A etal. eds., Summer School on High Energy Particle Accelerators, Fermi National Accelerator Laboratory, 1981, NewYork: AIP87, 1982:147