%0 Journal Article %T Addendum: Shqair, M., et al. Analytical Solution for Multi-Energy Groups of Neutron Diffusion Equations by a Residual Power Series Method. Mathematics 2019, 7, 633 %J Mathematics | An Open Access Journal from MDPI %D 2019 %R https://doi.org/10.3390/math7111061 %X Note: In lieu of an abstract, this is an excerpt from the first page. The authors wish to insert this additional sentence in the Acknowledgments section [... %U https://www.mdpi.com/2227-7390/7/11/1061