1. The double-bond in ethylene

   • A. M. S. C. Amaral
   • J. W. Linnett
   • C. T. Williamson

   Commentationes Pages: 249 - 262

2. Generalized quantum mechanical two-centre problems

   • Klaus Helfrich
   • Hermann Hartmann

   Commentationes Pages: 263 - 277

3. Approximate molecular orbital theory for inorganic molecules

   • R. D. Brown
   • K. R. Roby

   Commentationes Pages: 278 - 290

4. Approximate molecular orbital theory for inorganic molecules

   • R. D. Brown
   • K. R. Roby

   Commentationes Pages: 291 - 302

5. PPP and CNDO calculations for protonated molecules

   • Margaret L. Bailey
   • J. P. M. Bailey

   Commentationes Pages: 303 - 308

6. PPP calculations of the absorption spectra of purines and pyrimidines

   • Margaret L. Bailey

   Commentationes Pages: 309 - 315

7. The electronic structure of N-methyl-3pyridone and its representation

   • G. Berthier
   • B. Lévy
   • L. Paoloni

   Relatio Pages: 316 - 318