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Jinbing Chen, “Quasi-periodic solutions to a negative-order integrable system of 2-component KdV equation”, Int. J. Geom. Methods Mod. Phys., 15:03 (2018), 1850040
R. Orive, J.F. Sánchez Lara, “On external fields created by fixed charges”, Journal of Mathematical Analysis and Applications, 464:1 (2018), 119
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