Vanderbilt University, Nashville TN, USA.
University of Adriatic "G. D’Annunzio” Chieti-Pescara, Italy.
University of Michigan, MI, USA.
Missouri State University, MO, USA.
AquAeTer, Brentwood, TN, USA.
Memorial University of Newfoundland-Grenfell Campus, Canada.
Culiacán Institute of Technology, Mexico.
National Observatory of Athens, Athens, Greece.
University of Antananarivo, MADAGASCAR.
University of Zagreb, Croatia.