17.2; for more about the different types of astronomical objects associated with this, cf. Robson 1996 For a review, see Begelman, Blandford & Rees 1984.
17.2; pentru mai multe date privind diferitele tipuri de obiecte astronomice asociate cu acestea, cf. Robson 1996. ^ Vezi Begelman, Blandford & Rees 1984.