Eigen solutions and entropic system for Hellmann potential in the presence of the Schrödinger equationC. A. Onate, M. C. Onyeaju, A. N. Ikot and O. EbomwonyiEur. Phys. J. Plus, 132 11 (2017) 462DOI: https://doi.org/10.1140/epjp/i2017-11729-8