Hussein, A.Y., and N.H. Ali. “Frozen-Core Versus Fully-Correlated Configuration Interaction on the Ground and Lowest Excited States of N^{+} and N”. Acta Physica Polonica A ISSN 1898-794X , vol. 143, no. 4, May 2023, p. 316, https://doi.org/10.12693/APhysPolA.143.316.