1. American Mathematical Society, Summer Seminar on Nonlinear wave motion;Kruskal,1972
2. B. Berg, M. Karowski and H.J. Thun. Conserved currents in the massive Thirring model, FUB May 76/5.
3. Higher conserved charges in the massive Thirring model;Flume,1976
4. Particle number conservation in the massive thirring model