Media type: E-Article Title: Penalized Survival Models and Frailty Contributor: Therneau, Terry M; Grambsch, Patricia M; Pankratz, V. Shane Published: Informa UK Limited, 2003 Published in: Journal of Computational and Graphical Statistics, 12 (2003) 1, Seite 156-175 Language: English DOI: 10.1198/1061860031365 ISSN: 1061-8600; 1537-2715 Origination: Footnote: