Sparse inverse covariance estimation with the graphical lasso by Jerome H. Friedman and others 2026-11-05
Biostatistics 9(3), 432–441; DOI: 10.1093/biostatistics/kxm045. Online 12 December 2007. Equations 2.1, 2.6 and Remark 2.2. Statistician Jerome H. Friedman verified by Stanford Statistics faculty listing; distinct from physicist Jerome Isaac Friedman.