FRANCQ, C.; ZAKOÏAN, J.-M. Estimating ARCH Models when the Coefficients are Allowed to be Equal to Zero. Austrian Journal of Statistics, [S. l.], v. 37, n. 1, p. 31–40, 2016. DOI: 10.17713/ajs.v37i1.284. Disponível em: https://www.ajs.or.at/index.php/ajs/article/view/vol37%2C%20no1%20-%203. Acesso em: 8 oct. 2025.