A. M. A. Bertone, L. R. Pereira, I. da S. Pacheco, and L. G. Girotto, “GeoGebra as facilitator of a hypotrochoid generalization in an initiation scientific research project at undergraduate level”, Int J Innov Educ Res, vol. 6, no. 10, pp. 242–252, Oct. 2018, doi: 10.31686/ijier.vol6.iss10.1181.