@Article{	  Hosseini.Pouryayevali:2011,
  author	= {Hosseini, S. and Pouryayevali, M. R.},
  title		= {Generalized gradients and characterization of
		  epi-{L}ipschitz sets in {R}iemannian manifolds},
  journal	= {Nonlinear Anal.},
  fjournal	= {Nonlinear Analysis. Theory, Methods \& Applications. An
		  International Multidisciplinary Journal. Series A: Theory
		  and Methods},
  volume	= {74},
  year		= {2011},
  number	= {12},
  pages		= {3884--3895},
  doi		= {10.1016/j.na.2011.02.023},
  annote	= {journal},
  pdf		= {http://neitzel.ins.uni-bonn.de/research/pub/hosseini/journal7.pdf}
		  
}