Bound States in the Vortex Core
  The quasiparticle excitation spectrum of isolated vortices in clean layered d-wave superconductors is calculated. A large peak in the density of states in the "pancake" vortex core is found, in an agreement with the recent experimental data for high-temperature superconductors. 
Irena Knezevic and Zoran Radovic (University of Belgrade, Yugoslavia)