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HSTEP – Homogeneous Studies of Transiting Extrasolar PlanetsJohn SouthworthCambridge University Press2012DOI 10.1017/s174392131301332x
HSTERM — A Program to Calculate Potential Curves and Radial Matrix Elements for Two-electron Systems Within the Hyperspherical Adiabatic ApproachA.G. AbrashkevichElsevier Science1995DOI 10.1016/0010-4655(95)00084-s
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