Vidhya , S., G. Janaki, and T. Gokila. “Some Non-Extendable Special Diophantine Triples Involving Nonagonal Pyramidal Numbers”. Explorations in Diophantine Equations (November 11, 2023): 76–85. Accessed June 19, 2026. https://stm.bookpi.org/EDE/article/view/12436.