2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15233The observational properties of the six known Anomalous X-ray Pulsars are described in the context of the main theoretical models for this enigmatic class of objects.16 pages, latex, 3 figures, Invited review presented at the NATO ASI ''The Neutron Star - Black Hole Connection'' Elounda, Crete - 7-18 June 1999 Corrected units pag. 13 Also available at http://www.ifctr.mi.cnr.it/~sandro/WWW/axp.htmlAstrophysicstext