John Duchi, Elad Hazan and Yoram Singer; Journal of Machine Learning Research12(61),2121–2159(2011). Primary PDF: jmlr.org/papers/volume12/duchi11a/duchi11a.pdf
First-page full bylines verified. Section1.1, printed pp2122–2124, Eq1 and Eq5: cumulative gradient outer-product matrix, diagonal specialization and additive stabilization outside its square root. Used for mathematical mechanisms, not benchmark or convergence claims beyond their stated hypotheses.
Primary source: yoram-singer.github.io/
Verified locator: Named personal homepage, machine-learning research statement, publication links and portrait figs/y.jpg. Short biography yoram-singer.github.io/bio.html . No career dates reused in article.