1. Investigation of the electronic structure of Ticl₄

   • C. A. L. Becker
   • C. J. Ballhausen
   • I. Trabjerg

   Commentationes Pages: 355 - 364

2. Non-empirical LCAO-MO-SCF calculations with gaussian type functions on the electrocyclic transformation of cyclopropyl to allyl

   • D. T. Clark
   • D. R. Armstrong

   Commentationes Pages: 365 - 380

3. Hartree-Fock-Roothaan wave functions, electron density distribution, diamagnetic susceptibility, dipole polarizability and antishielding factor for ions in crystals

   • Eustratios Paschalis
   • Alarich Weiss

   Commentationes Pages: 381 - 408

4. Some new aspects of π-electron theory

   • M. V. Basilevsky

   Commentationes Pages: 409 - 420

5. A modified Hückel method for calculating ring current contributions to the diamagnetic susceptibilities of conjugated hydrocarbons

   • A. T. Amos
   • H. G. Ff. Roberts

   Commentationes Pages: 421 - 427

6. Spin contamination in PPP unrestricted Hartree-Fock wave functions

   • D. R. Burnham

   Relatio Pages: 428 - 432

7. Erratum

   • M. F. Rettig
   • P. S. Han
   • T. P. Das

   Erratum Pages: 432 - 432