Collaborations in the last years

George L. Barnes (Siena College, USA)

Joaquín Espinosa-García (Universidad de Extremadura) 

Antonio Fernández-Ramos (Universidade de Santiago de Compostela, Spain)

Dave Glowacki (University of Bristol, UK)

Bill Hase (Texas Tech, USA)

Jorge Marques (Universidade de Coimbra, Portugal)

Juanjo Nogueira (Australian National University)

Maurizio Persico (Universita de Pisa, Italy)