•Modern disk paper
 with AGN application, Koratkar and
 Blaes (1999), review in PASP:
 
 •Basic ideas follow
 from the Shakura and Sunyaev (1973)
 standard alpha thin disks, plus relativity, vertical disk structure, non-LTE, Comptonization,
 etc.  The models of Hubeny et al. (2000) are among the most advanced and available on-line: