M. Jamalabdollahi, A. Mirzaeinia, and S. Salari. 2012 14th International Conference on Advanced Communication Technology (ICACT), page 832-836. (February 2012)
V. Alfi, A. Petri, and L. Pietronero. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)