C. Urry, and P. Padovani. (1995)cite arxiv:astro-ph/9506063
Comment: 88 pages, latex file, uses aaspp.sty macro (available via ftp from
ftp://aas.org/pubs/aastex/). Accompanying 22 figures and 3 tables available
at http://itovf2.roma2.infn.it/padovani/review.html. (Abstract is abridged.)
The only change is that the revised version indicates this paper is an
invited review for PASP, in press, September 1995 issue.
M. Schubnell. (2009)cite arxiv:0905.0444
Comment: 4 pages, 3 figures, to be published in the proceedings of "44th
Rencontres de Moriond", La Thuile (Val d'Aosta, Italy) "Very High Energy
Phenomena in the Universe".