V. Hernández, J. Román, and A. Tomás. PARCO, volume 33 of John von Neumann Institute for Computing Series, page 221-228. Central Institute for Applied Mathematics, Jülich, Germany, (2005)
E. Herrera-Viedma, J. Riera, S. Massanet, and J. Torrens. IEEE Conf. on Intelligent Systems (1), volume 322 of Advances in Intelligent Systems and Computing, page 319-330. Springer, (2014)