On algebraic characterization of coercive linear partial differential operators with constant coefficients J. Tervo — 1989 Annales Polonici Mathematici
On equality of minimal and maximal realizations J. Tervo — 1991 Commentationes Mathematicae The article contains no abstract
Exponential stability of a nonlinear distributed parameter system. Tervo, J.; Nihtilä, M. — 2000 Zeitschrift für Analysis und ihre Anwendungen
On controllability, parametrization, and output tracking of a linearized bioreactor model. Tervo, J.; Nihtilä, M.T.; Kokkonen, P. — 2003 Journal of Applied Mathematics