N. ANUSHEELA; Shreemathi ADIGA; M. A. GOPALAN. The Negative Pell Equation y2 = 90x2 - 36: A Mathematical Observation. Research and Applications Towards Mathematics and Computer Science Vol. 4, [S. l.], p. 44–50, 2023. DOI: 10.9734/bpi/ratmcs/v4/6180B. Disponível em: https://stm.bookpi.org/RATMCS-V4/article/view/11811. Acesso em: 4 jun. 2026.