Shannon information entropy sum of the confined hydrogenic atom under the influence of an electric fieldS. J. C. Salazar, H. G. Laguna, B. Dahiya, V. Prasad and R. P. SagarEur. Phys. J. D, 75 4 (2021) 127DOI: https://doi.org/10.1140/epjd/s10053-021-00143-2