Antonio Borges, R.; Rabelo, M. N.; Purcina, A. B. .; Henrique, M. L. . Dynamic Modeling and Stability Analysis of a Nonlinear System With Primary Resonance. Int J Innov Educ Res 2020, 8 (3), 391-414. https://doi.org/10.31686/ijier.vol8.iss3.2245.