Addendum: Analytical solution for multi-energy groups of neutron diffusion equations by a residual power series method. [Mathematics (2019) 7, 633]doi 10.3390/math7070633

The authors wish to insert this additional sentence in the Acknowledgments section [1]: "The financial support of the project (Using New Mathematical Methods in Solving Neutron Diffusion Equations in Bare and Reflected Nuclear Reactors) funded by the Deanship of Scientific Research at Prince Sattam Bin Abdulaziz University within the Specialized Research Grant program and under contract number 2017/01/7676 is gratefully acknowledged." The authors would like to apologize for any inconvenience caused to the readers by these changes. The changes do not affect the scientific results. The manuscript will be updated and the original will remain online on the article webpage, with reference to this Addendum.