Wave-field phase singularities: The sign principle.

@article{Freund1994WavefieldPS,
  title={Wave-field phase singularities: The sign principle.},
  author={R W Freund and Shvartsman},
  journal={Physical review. A, Atomic, molecular, and optical physics},
  year={1994},
  volume={50 6},
  pages={5164-5172}
}
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