1. Acyclic systems with extremal Hückel π-electron energy

   • Ivan Gutman

   Original Investigations Pages: 79 - 87

2. Note on open shell restricted SCF calculations for rotation barriers about C-C double bonds: Ethylene and allene

   • Volker Staemmler

   Original Investigations Pages: 89 - 94

3. The heisenberg exchange integral in a non-orthogonal basis for antiferromagnetic and ferromagnetic systems

   • George R. Tsaparlis
   • Sidney F. A. Kettle

   Original Investigations Pages: 95 - 109

4. The spatial distribution of localized molecular orbital densities

   • Michael E. Stephens
   • Ede Kapuy
   • Cornelia Kozmutza

   Original Investigations Pages: 111 - 120

5. Ab initio SCF MO calculations on the CH₃Br molecule

   • Guillermo P. del Conde
   • Paul S. Bagus
   • Charles W. Bauschlicher Jr.

   Original Investigations Pages: 121 - 126

6. The catalytic effect of BF₃ on the electrophilic hydrogen exchange reaction in benzene

   • Giuliano Alagona
   • Eolo Scrocco
   • Jacopo Tomasi

   Original Investigations Pages: 127 - 136

7. Quantum-theoretical treatment of motions of ions in ion cyclotron resonance cells

   • Hermann Hartmann
   • Kyu -Myung Chung

   Original Investigations Pages: 137 - 145

8. Multipole expansion of diatomic overlap

   • Othmar Steinhauser
   • Peter Schuster

   Original Investigations Pages: 147 - 156