1. Causality and the impulse response scandal
2. Notes on representation theorems for linear discrete-space systems. Proceedings of the International Symposium on Circuits and Systems, Orlando, FL, 30 May–2 June 1999 (four pages on CD).
3. Notes on Linear Systems and Impulse Responses
4. Notes on multidimensional linear system representations. Thirty-eighth Annual Conference on Information Sciences and Systems, Department of Electrical Engineering, Princeton University, Princeton, NJ, March 2004; 801–806.