A quantum mechanical description of the experiment on the observation of gravitationally bound statesA. Westphal, H. Abele, S. Baeßler, V.V. Nesvizhevsky, K.V. Protasov and A.Y. VoroninEur. Phys. J. C, 51 2 (2007) 367-375DOI: https://doi.org/10.1140/epjc/s10052-007-0283-x