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On the accuracy of the perturbative approach for strong lensing: local distortion for pseudo-elliptical models
Habib S. Dúmet-Montoya, Gabriel B. Caminha, Bruno Moraes, et al. Monthly Notices of the Royal Astronomical Society 433(4) 2975 (2013) https://doi.org/10.1093/mnras/stt938
Asymptotic solutions for the case of nearly symmetric gravitational lens systems