PLANCK SCALE PHYSICS AND THE PECCEI-QUINN MECHANISM
Phys.Lett.B 282 (1992) 137-141
QUANTUM FIELD THEORY OF NONABELIAN STRINGS AND VORTICES
Nucl.Phys.B 384 (1992) 251
Internal Frame Dragging and a Global Analog of the Aharonov-Bohm Effect
(1991)