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Three of us want to acknowledge to the Provost’s Research Fund of Arizona State University for financial assistance received in summer 1980.
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Lu, P., Chan, C.K., Wang, A.P. et al. Solution of coupled equations by the wkb approximations. Lett. Nuovo Cimento 29, 278–282 (1980). https://doi.org/10.1007/BF02743302
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DOI: https://doi.org/10.1007/BF02743302