**CONTENTS, vol. 18, '92**

## Research papers

- Z. Onyszkiewicz
*Statistical Operators for Two Arbitrary Parts of
Closed Universe*
- U. Kasper
*Particle and Entropy Creation in Cosmology*
- A. Woszczyna
*On a Deviation from Jeans' Instability Criterion*
- M. Heller, P. Multarzynski, W. Sasin and Z. Zekanowski
*On Some Generalizations of the Manifold Concept*
- J. Gruszczak, M. Heller and W. Sasin
*Quasiregular Singularity of a Cosmic String*
- M. Heller, W. Sasin, A. Trafny and Z. Zekanowski
*Differential Spaces and New Aspects of Schmidt's
b--Boundary of Space--Time*
- W. Rudnicki
*Can a Generic Strong Curvature Singularity be Visible
from Infinity?*
- M. Szydlowski
*Dynamical Effects of the ``Extra" Dimensions in
Multidimensional Homogeneous Cosmology*

## Book Reviews

*Primordial Nucleosynthesis and Evolution of the Early
Universe*, edited by K. Sato, J. Audouze

*Observational Tests of Cosmological Inflation*, edited
by T. Shanks, A.J. Banday, R.S. Ellis, C.S. Frenk, A.W.
Wolfendale

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