N. Anusheela, Shreemathi Adiga and M. A. Gopalan. The Negative Pell Equation y2 = 90x2 - 36: A Mathematical Observation. RATMCS-V4 [Internet]. 2023 Sep. 9 [cited 2026 Jun. 4];:44-50. Available from: https://stm.bookpi.org/RATMCS-V4/article/view/11811