Publications
Realization theory for Hamiltonian systems. SIAM J. Control Optim.. 1987;25:63-73.
The geometry of 2×2 systems of conservation laws. Acta Applicandae Mathematicae. 2005;88(3):269-329.
The geometry of $2\times 2$ systems of conservation laws. Acta Appl. Math.. 2005;88:269-329.Edit
Second-order conditions for local controllability. Systems Control Lett.. 1998;35:287-290.
Geometric conditions for local controllability. J. Differential Equations. 1991;89:388-395.
Equivalence of gradient systems. Portugal. Math.. 1981;40:263-277 (1985).
Invariant manifolds of a differentiable vector field. Portugal. Math.. 1993;50:497-505.
Controllability in codimension one. J. Differential Equations. 1987;68:1-9.
Linearization of resonant vector fields. Trans. Amer. Math. Soc.. 2010;362:6457-6476.
Analytic $k$-linearizability of some resonant Poisson structures. Lett. Math. Phys.. 1999;49:59-66.Edit
Local controllability of scalar input systems on $3$-manifolds. Systems Control Lett.. 1991;16:349-355.
Nonlinear observability and duality. Systems Control Lett.. 1984;4:97-101.
Analytic linearizability of some resonant vector fields. Proc. Amer. Math. Soc.. 2001;129:2473-2481 (electronic).Edit
Singularities of Euler equations and implicit Hamilton equations. In: Real and complex singularities ({S}ão {C}arlos, 1994). Vol 333. Longman, Harlow; 1995. 2. p. 203-212p.
Sufficient conditions for local controllability with unbounded controls. SIAM J. Control Optim.. 1987;25:1371-1378.
[2004-5] Linearization of resonant vector fields .
Symplectic rigidity and flexibility of ellipsoids. Indag. Math. (N.S.). 2013;24:264-278.
[2012-38] Local geometry of surfaces in $\mathbf R^4$ .
On the Average Complexity of Partial Derivative Automata for Semi-Extended Expressions. Journal of Automata, Languages and Combinatorics. 2017;22:5-28.Edit
On the State Complexity of Partial Derivative Automata for Regular Expressions with Intersection. In: Proceedings of the 18th Int. Workshop on Descriptional Complexity of Formal Systems (DCFS16). Vol 9777. Springer; 2016. 4. p. 45-59p. (LNCS; vol 9777).Edit