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A general approach to evaluation of two-centre two-electron exponentialintegrals with arbitrary parameters is presented. The results for theBorn-Oppenheimer potential for various excited states of molecular hydrogenwith Ko{\l} os-Wolniewicz functions are obtained with precision exceedingprevious values by about 3 orders of magnitude.

Efficient approach to two-centre exponential integrals with applications to excited states of molecular hydrogen