1. Is the universe expanding?

   • G. F. R. Ellis

   Research Articles Pages: 87 - 94

2. What is the effective stress energy of particles created from the vacuum?

   • Robert M. Wald

   Research Articles Pages: 95 - 100

3. The problem of scalar field theory in curved space-time

   • Mario Castagnino

   Research Articles Pages: 101 - 121

4. Effect of a gravitational wave on electromagnetic radiation confined in a cavity: I. boundary coupling

   • P. Tourrenc

   Research Articles Pages: 123 - 140

5. Effect of a gravitational wave on electromagnetic radiation confined in a cavity: II. Intrinsic coupling

   • P. Tourrenc

   Research Articles Pages: 141 - 153

6. Time machine and geodesic motion in Kerr metric

   • M. Calvani
   • F. de Felice
   • F. Salmistraro

   Research Articles Pages: 155 - 163

7. Orbital topography and other astrophysical consequences of Rosen's bimetric theory of gravity

   • W. R. Stoeger

   Research Articles Pages: 165 - 174

8. Orthonormal tetrads and the charged fluid in general relativity

   • G. G. Asgekar
   • T. H. Date

   Research Articles Pages: 175 - 181