@unpublished{ Hosseini:2015*1, author = {S. Hosseini}, title = {Optimality conditions for global minima of nonconvex functions on {R}iemannian manifolds}, year = {2015}, annote = {journal}, pdf = {http://neitzel.ins.uni-bonn.de/research/pub/hosseini/3.pdf} , note = {Accepted in Pac. J. Optim.} }