Massaro, Francesco; Paggi, A.; Errando, M.; D'Abrusco, Raffaele; Masetti, N.; Tosti, G.; Funk, S.
(2013)
BL Lac objects are the most numerous class of extragalactic TeV-detected sources. One of the biggest difficulties in investigating their TeV emission is due to their limited number, since only 47 BL Lac objects are known ...