7. J.Gruszczak, M. Heller
Singularities in stochastically Predictable Universe
Physics Letters A, vol. 106, pp. 13-16 (1984).
[abstract]

Abstract:
Abstract.

8. J. Gruszczak, M. Heller, M. Szydlowski
The Universe as a Stochastic Process
Physics Letters A, vol. 100, pp. 82-84 (1982).
[abstract]

Abstract:
Abstract

9. J. Gruszczak
Two-soliton solution of the Ernst Equation
Journal of Physics A, vol. 14, pp. 3247-3251 (1981).
[abstract]

Abstract:
A connection between the Ernst equation and the chiral model on SL(2, R) is established. The Belinsky-Zakharov inverse method is used to solve the Ernst equation. Two-soliton solutions of the Ernst equation are given. It is shown that the two-soliton solution obtained from the Minkowski space-time is the NUT generalisation of the Kerr solution.