Non-selfadjoint perturbations of selfadjoint operators in 2 dimensions IIIa. One branching point
英文摘要：
This is the third in a series of works devoted to spectral asymptotics for non-selfadjoint perturbations of selfadjoint $h$-pseudodifferential operators in dimension 2. We assume that the unperturbed operator has a periodic Hamilton flow, and study the remaining generic case; when the flow average of the perturbation has a saddle point
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