VILLEGAS, Marco A.; PEDREGAL, Diego J. SSpace: A Toolbox for State Space Modeling. Journal of Statistical Software, [S. l.], v. 87, n. 5, p. 1–26, 2018. DOI: 10.18637/jss.v087.i05. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v087i05. Acesso em: 9 apr. 2025.