1. Diffraction of a plane electromagnetic wave at a schwarzschild black hole

   • E. Herlt
   • H. Stephani

   OriginalPaper Pages: 81 - 93

2. The theory of rest-mass quantisation

   • Thomas Chacko

   OriginalPaper Pages: 95 - 102

3. A model field theory in which two Nambu-Goldstone symmetries are realised by one massless pseudoscalar boson

   • D. J. Almond

   OriginalPaper Pages: 103 - 134

4. Crux of the clock paradox

   • Kenneth J. Epstein

   OriginalPaper Pages: 135 - 139

5. Observables and transformation properties of fermions and parafermions constructed in terms of bosons. I. The physical variables

   • Andrés J. Kálnay
   • K. V. Kademova

   OriginalPaper Pages: 141 - 143

6. Observables and transformation properties of fermions and parafermions constructed in terms of bosons. II. Transformation laws

   • Andrés J. Kálnay
   • K. V. Kademova

   OriginalPaper Pages: 145 - 147

7. On the statistics consistent with Nambu's new quantum rules. Quarks?

   • Máximo García Sucre
   • Andrés J. Kálnay

   ‘Letters’ Section Pages: 149 - 151