1. The calculation of ground and excited state molecular polarizabilities: A simple perturbation treatment

   • Francis T. Marchese
   • H. H. Jaffé

   Original Investigations Pages: 241 - 247

2. On the affinity of cytosine towards electrophiles

   • Alberte Pullman
   • Anne Marie Armbruster

   Original Investigations Pages: 249 - 256

3. Quantum mechanical studies of environmental effects on biomolecules

   • Yoshimasa Orita
   • Alberte Pullman

   Original Investigations Pages: 257 - 267

4. Theoretical study of the electronic structure of diazomethane

   • Jacques Lievin
   • Georges Verhaegen

   Original Investigations Pages: 269 - 281

5. On the excited states ofp-quinones and an interpretation of the photocycloaddition ofp-quinones to alkenes

   • Nigel J. Bunce
   • Joan E. Ridley
   • Michael C. Zerner

   Original Investigations Pages: 283 - 300

6. Spin-adapted wave functions of the serber type and time reversal

   • Jan Vojtík
   • Jiří Fišer

   Original Investigations Pages: 301 - 307

7. Topological properties of benzenoid systems

   • Ivan Gutman

   Original Investigations Pages: 309 - 315

8. Direct minimization of the energy functional in the LCAO-MO density matrix formalism

   • Piercarlo Fantucci
   • Stefane Polezzo

   Original Investigations Pages: 317 - 324

9. Book reviews

   • Hans Sillescu

   BookReview Pages: 325 - 326