‘tripleint_cc’: A program for 2-centre variational leptonic Coulomb potential matrix elements using Hylleraas-type trial functions, with a performance optimization study
aComputational Science and Engineering, STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK;bSchool of Mathematical Sciences, University of Nottingham, Nottingham NG7 2RD, UK