1. U. Oberst, Variations on the fundamental principle for linear systems of partial differential and difference equations with constant coefficients. AAECC 6, 211–243 (1995)
2. H.-J. Schmeißer, Höhere Analysis. Lecture Notes (Universität Jena, 2005)
3. L. Schwartz. Théorie des distributions. Publications de l’Institut de Mathématique de l’Université de Strasbourg, No. IX–X. (Hermann, Paris, nouvelle édition, entiérement corrigée, refondue et augmentée edition, 1966)
4. L.Hörmander, The Analysis of Linear Partial Differential Operators. I. Distribution Theory and Fourier Analysis, vol. 256 of Grundlehren der Mathematischen Wissenschaften (Springer, Berlin, 1983)
5. J.W. Polderman, J.C. Willems, Introduction to Mathematical Systems Theory. A Behavioral Approach. Texts in Applied Mathematics, vol. 26 (Springer, New York, 1998)