1. Loop currents in chlorophyll a

   • Roger E. Clapp

   Original Investigations Pages: 105 - 133

2. Orbital forms of gap equations and instability conditions

   • Jean-Louis Calais

   Original Investigations Pages: 135 - 147

3. Perturbative solution of the RPA equation. An application to the calculation of rotational strengths

   • Jean-Pierre Flament
   • Henri-Pierre Gervais

   Original Investigations Pages: 149 - 162

4. Extended Hückel calculations of the ionization potentials of some conjugated hydrocarbons

   • Robert James Jerrard
   • Alfred Terry Amos
   • Peter Arthur Brook

   Original Investigations Pages: 163 - 170

5. The valence bond description of xylylenes

   • Philippe C. Hiberty
   • Padeleimon Karafiloglou

   Original Investigations Pages: 171 - 177

6. An extended PCILO method

   • Roman Boča

   Original Investigations Pages: 179 - 192

7. Changes in the band structure of a simple polymer on lowering the translational symmetry

   • D. A. Morton-Blake

   Original Investigations Pages: 193 - 202