β© π΅ π΅ π΅ βͺββ« High-Energy Astrophysics Collections β βͺπβ« Astronomy Texts β βͺπβ« HEASoft Texts β βͺπβ« High-Energy Astrophysics Papers β Accretion Power in Astrophysics β¬π An X-ray Data Primer β¬π Diploma Thesis of Manfred Hanke β¬π Shapiro & Teukolsky 1983 β Black Holes, Whiteβ¦ β¬π X-Ray Spectroscopy βΆ In Theory and Practice β¬π