1. On the gravitational field of a massless particle

   • P. C. Aichelburg
   • R. U. Sexl

   Research Articles Pages: 303 - 312

2. On the meaning of the Einstein- and the Lorentz-covariant derivation

   • Hans -Juergen Treder

   Research Articles Pages: 313 - 319

3. On Datta's spherically symmetric systems in general relativity

   • Hermann Bondi

   Research Articles Pages: 321 - 329

4. Static gravitational multipoles — The connection between field and source in general relativity

   • C. J. S. Clarke
   • D. W. Sciama

   Research Articles Pages: 331 - 345

5. On the gravitational field acting as an optical medium

   • Fernando de Felice

   Research Articles Pages: 347 - 357

6. C^∞ solutions of hyperbolic non linear equations applications in G.R.G.

   • Yvonne Choquet-Bruhat

   Research Articles Pages: 359 - 362

7. Sandwich data leading to elliptic equations

   • Peter G. Bergmann

   Research Articles Pages: 363 - 366

8. A universe embedded in a five-dimensional flat space

   • Itzhak Goldman
   • Nathan Rosen

   Research Articles Pages: 367 - 384

9. On spherically symmetric perfect fluid distributions and class one property

   • J. Krishna Rao

   Letter to the Editor Pages: 385 - 386

10. Report on GR6, The International Conference on Gravitation and Relativity, Copenhagen, 5th–10th July 1971

    • M. Camenzind

    Report Pages: 387 - 407

11. Announcement of the summer schools 1972 and later

    Announcement Pages: 409 - 409