- E. N. Barron, W. Liu, “Semicontinuous solutions for Hamilton-Jacobi equations and theL ?control problem”, Appl Math Optim, 34, № 3, 1996, 325

- Jean-Paul Penot, Michel Volle, 502, Generalized Convexity and Generalized Monotonicity, 2001, 294

- Jean-Paul Penot, 266, Calculus Without Derivatives, 2013, 407

- Peter R. Wolenski, Yu Zhuang, “Proximal Analysis and the Minimal Time Function”, SIAM J. Control Optim., 36, № 3, 1998, 1048

- F. H. Clarke, P. R. Wolenski, “Control of systems to sets and their interiors”, J Optim Theory Appl, 88, № 1, 1996, 3

- Richard Vinter, Optimal Control, 2010, 61

- Jean-Paul Penot, 266, Calculus Without Derivatives, 2013, 263

- P. M. Carvalho Neto, P. A. Liboni Filho, “A mean value theorem for metric spaces”, Math. Nachr., 288, № 5-6, 2015, 509

- Didier Aussel, Jean-Noël Corvellec, Marc Lassonde, “Nonsmooth Constrained Optimization and Multidirectional Mean Value Inequalities”, SIAM J. Optim., 9, № 3, 1999, 690

- Richard Vinter, Optimal Control, 2010, 397
