Alp Simsek Asuman E. Ozdaglar Daron Acemoglu Generalized Poincaré-Hopf Theorem for Compact Nonsmooth Regions. 193-214 2007 32 Math. Oper. Res. 1 http://dx.doi.org/10.1287/moor.1060.0235 db/journals/mor/mor32.html#SimsekOA07