- I.J. Taneja, Fixed and Flexible Power Narcissistic Numbers with Division, https://inderjtaneja.com/2018/09/25/2652/. Also, Fixed and Flexible Powers Narcissistic Numbers with Division,Zenodo, February 19, 2019, pp. 1-142, http://doi.org/10.5281/zenodo.2573047.
- I.J. Taneja, Factorial-Power Selfie Expressions, Zenodo, February 20, 2019, pp. 1-115, http://doi.org/10.5281/zenodo.2573569.
- I.J. Taneja, Fraction-Type Single Letter Representations of Natural Numbers From 1 to 11111, Zenodo, February 4, 2019, pp. 1-203,http://doi.org/10.5281/zenodo.2556902.