1. On the Algebras of BPS States

   • Jeffrey A. Harvey
   • Gregory Moore

   Pages: 489 - 519

2. Estimates of Periodic Potentials in Terms of Gap Lengths

   • Evgeni Korotyaev

   Pages: 521 - 526

3. Asymptotic Behaviour of the Ground State of Singularly Perturbed Elliptic Equations

   • Andrey L. Piatnitski

   Pages: 527 - 551

4. Wannier--Bloch Oscillators

   • Vincenzo Grecchi
   • Andrea Sacchetti

   Pages: 553 - 569

5. Four-Dimensional Yang–Mills Theory as a Deformation of Topological BF Theory

   • A. S. Cattaneo
   • P. Cotta-Ramusino
   • M. Zeni

   Pages: 571 - 621

6. Discontinuity of the Spin-Wave Stiffness in the Two-Dimensional XY Model

   • L. Chayes

   Pages: 623 - 640

7. Soliton Immersions

   • R. K. Dodd

   Pages: 641 - 665

8. Duality Symmetries and Noncommutative Geometry of String Spacetimes

   • Fedele Lizzi
   • Richard J. Szabo

   Pages: 667 - 712

9. Twistor Spaces for QKT Manifolds

   • P. S. Howe
   • A. Opfermann
   • G. Papadopoulos

   Pages: 713 - 727