Exact non-Born-Oppenheimer wave function for the Hooke-Calogero model of the H2 molecule - A useful exact molecular model for electron correlation studiesX. Lopez, J. M. Ugalde and E. V. LudeñaEur. Phys. J. D, 37 3 (2006) 351-359DOI: https://doi.org/10.1140/epjd/e2006-00024-4