Maisalatee, A. U., et al. “Generalization of Quantum Mechanical Wave Equation in Spherical Coordinate Using Great Metric Tensors and a Variable Gravitational Scalar Potential”. International Astronomy and Astrophysics Research Journal, vol. 2, no. 1, July 2020, pp. 139-47, https://journaliaarj.com/index.php/IAARJ/article/view/22.