Nobre, Aline Araújo, et al. “Multinomial Model and Zero-Inflated Gamma Model to Study Time Spent on Leisure Time Physical Activity: An Example of ELSA-Brasil”. Revista De Saúde Pública, vol. 51, Jan. 2017, p. 76, https://doi.org/10.11606/s1518-8787.2017051006882.