A. Sanchez Orta (October 2018) - Researcher at CINVESTAV - Saltillo. Mexique.
Danilo Alves de Lima (December 2017) - Professor at Federal University of Lavras - UFLA, Brazil.
P. Garcia Gil (December 2017) - Professor at the UPV, Spain.
Hugo Romero (November 2017) - Professor at the UAEH, Mexico.
Corina Sandu (October 2017) - Professor at the Virginia Tech, USA.
Alexandre Santos Brandao (January-February 2017) - Professor at the Federal University of Viçosa, Viçosa, Brazil.
O. Garcia Salazar (November 2015) - Professor at the UANL, Mexico.
M. Jimenez Lizarraga (July 2015) - Professor at the UANL, Mexico.
P. Gil Garcia (March 2012) - Professor at the Universidad Politécnica de Valencia, Spain.