1. Manifolds of negative curvature
2. Burachik R., Sagastiz l C., Svaiter B.F. (1999). Bundle methods for maximal monotone operators, Ill-posed variational problems and regularization techniques (Trier, 1998), In: Lecture Notes in Econom. and Math. Systems, 477: Springer, Berlin, pp. 49-64.
3. Riemannian Geometry
4. da Cruz Neto J.X., Ferreira O.P. and Lucambio Pérez L.R. (2002). Contribution to the study of monotone vectorfields, to be pubished in Acta Mathematica Hungarica.