Papers

• A.E. Frazho, S. ter Horst, and M.A. Kaashoek, Optimal solutions to matrix-valued Nehari problems and related limit theorems, accepted.
• S. ter Horst, Redheffer representations and relaxed commutant lifting, Complex Anal. Oper. Theory, to appear, (2011).
• J.A. Ball, V. Bolotnikov, and S. ter Horst, Abstract interpolation in vector-valued de Branges-Rovnyak spaces, Integral Equations Operator Theory  70 (2011), 227--263.
• J.A. Ball, V. Bolotnikov, and S. ter Horst, Interpolation in de Branges-Rovnyak spaces, Proc. Amer. Math. Soc.  139 (2011), 609--618.
• J.A. Ball, V. Bolotnikov, and S. ter Horst, A constrained Nevanlinna-Pick interpolation problem for matrix-valued functions, Indiana Univ. Math. J.  59 (2010), 15--52.
• J.A. Ball and S. ter Horst, Robust control, multidimensional systems and multivariable Nevanlinna-Pick interpolation, In: Topics in Operator Theory, pp. 13-88, OT   203 Birkhauser, Basel, 2010.
• J.A. Ball and S. ter Horst, Multivariable operator-valued Nevanlinna-Pick interpolation: a survey, In: Operator Algebras, Operator Theory and Applications, pp. 1-73, OT   195 Birkhauser, Basel, 2010.
• J.A. Ball and S. ter Horst, Robust control, multidimensional systems and multivariable function theory: Commutative and noncommutative settings, Proceedings of MTNS 2010.
• A.E. Frazho, S. ter Horst, and M.A. Kaashoek, A time-variant norm constrained interpolation problem arising from relaxed commutant lifting, In: Operator Algebras, Operator Theory and Applications, pp. 139-167, OT   195 Birkhauser, Basel, 2010.
• J.A. Ball, Q. Fang, G.J. Groenewald, and S. ter Horst, Equivalence of robust stabilization and robust performance via feedback, Math. Control Signals Syst. 21 (2009), 51--68.
• J.A. Ball and S. ter Horst, A W*-correspondence approach to multi-dimensional linear dissipative systems, Proceedings of the N-D Systems conference 2009, Thessaloniki, Greece.
• S. ter Horst, Relaxed commutant lifting: existence of a unique solution, Proc. Amer. Math. Soc. 137 (2009), 2697--2707.
• S. ter Horst, Relaxed commutant lifting and a relaxed Nehari problem: Redheffer state space formulas, Math. Nachr. 282 (2009), 1753--1769.
• J.A. Ball, A. Biswas, Q. Fang, and S. ter Horst, Multivariable generalizations of the Schur class: positive kernel characterization and transfer function realization, In: Recent Advances in Operator Theory and Applications, pp. 17-79, OT  187 Birkhauser, Basel, 2008.
• A.E. Frazho, S. ter Horst, and M.A. Kaashoek, Relaxed commutant lifting: an equivalent version and a new application, In: Recent Advances in Operator Theory and Applications, pp. 157-168, OT  187 Birkhauser, Basel, 2008.
• A.E. Frazho, S. ter Horst, and M.A. Kaashoek, All solutions to the relaxed commutant lifting problem, Acta Sci. Math. (Szegged) 72 (2006), 299--318.
• A.E. Frazho, S. ter Horst, and M.A. Kaashoek, Coupling and relaxed commutant lifting, Intergral Equations and Operator Theory 54 (2006), 33--67.

My Ph.D. thesis: