Casas, S. I., J. B. G. Perez-Schofield, and C. A. Marcos. “Associations in Conflict”. INFOCOMP Journal of Computer Science, vol. 6, no. 2, Jan. 2007, pp. 27-36, https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/171.