Gianni Betti (EDT)/ Achille Lemmi (EDT)
(3)
Betti Marenko (EDT)/ Jamie Brassett (EDT)
(2)
Ricardo Betti/ Ricardo Filho
(2)
Silvello Betti (University of Rome Tor Vergata),Pierluigi Perrone (University of Rome Tor Vergata),Giuseppe Giulio Rutigliano
(2)
Betti Bannasch Dingelmaier Dogramaci
(1)