RT Journal Article SR 00 ID 10.1137/060670080 A1 Bolte, Jérôme A1 Daniilidis, Aris A1 Lewis, Adrian A1 Shiota, Masahiro T1 Clarke Subgradients of Stratifiable Functions JF SIAM Journal on Optimization YR 2007 FD 2007 VO 18 IS 2 SP 556 OP 572 LK https://publications.ut-capitole.fr/id/eprint/3431/ UL http://tse-fr.eu/pub/23257