2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11357Since 1992 the CANGAROO 3.8m imaging telescope has been used to search for sources of TeV gamma-rays. Results are presented here for observations of four Southern Hemisphere BL-Lacs - PKS0521-365, PKS2316-423, PKS2005-489 and EXO0423-084. In addition to testing for steady DC emission, a night by night burst excess search has been performed for each source.4 pages, 1 figure, LaTeX 2e with epsfig.sty, wrapfig.sty to appear in proceedings of the 25th ICRC, Durban, 1997Astrophysicstext