1. Generalized Wronskian formula for solutions of the KdV equations: first applications
2. “Theory of Positons I”, preprint of the Max-Planck-Institut für Metallforschung in Stuttgart 1992, submitted for publication
3. Two-dimensional solitons of the Kadomtsev-Petviashvili equation and their interaction
4. Oscillating and reflectionless potentials, eigenvalues in the continuous spectrum and the relation with the KdV equation, in the Proceedings of the All-Union Conference on Partial Differential Equations dedicated to the 75th birthday of Academician I. G. Petrovsky, ed. by (Moscow University Press, Moscow 1978), 378–379 (in Russian)
5. “Positons of the Enneper (sine-Gordon) Equation”, preprint of the Max-Planck-Institut für Metallforschung in Stuttgart 1992