Demina, Maria V. “Integrability and Jacobi Last Multipliers of Cubic Li’{e}nard Differential Equations With Quadratic Damping”. Discontinuity, Nonlinearity, and Complexity, vol. 9, no. 4, Aug. 2026, pp. 499-07, https://doi.org/10.5890/DNC.2020.12.002.