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Physical Review Letters – 27 May 1991
Volume 66, Issue 21

LETTERS

General Physics

Gravitation and Astrophysics

Elementary Particles and Fields

Nuclear Physics

Atomic, Molecular, and Optical Physics

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, Etc.

Condensed Matter: Structure, Etc.

Condensed Matter: Electronic Properties, Etc.

COMMENTS

ERRATA