A Comment on the Letter by J. Durnin et al., Phys. Rev. Lett. 58, 1499 (1987).
DOI:https://doi.org/10.1103/PhysRevLett.66.837
©1991 American Physical Society
P. Sprangle
B. Hafizi
Vol. 66, Iss. 6 — 11 February 1991
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