TY - JOUR AU - Borwein, Jonathan AU - Fitzpatrick, Simon AU - Girgensohn, Roland TI - Subdifferentials Whose Graphs Are Not Norm × Weak* Closed JO - Canadian mathematical bulletin PY - 2003 SP - 538 EP - 545 VL - 46 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-051-5/ DO - 10.4153/CMB-2003-051-5 ID - 10_4153_CMB_2003_051_5 ER -