Here's the paper (PDF):
http://physics.aps.org/featured-article-pdf/10.1103/PhysRevL...
It's about observations & theory where you can get waves in Cherenkov radiation which propagate against the dominant direction.
http://physics.aps.org/featured-article-pdf/10.1103/PhysRevL...
It's about observations & theory where you can get waves in Cherenkov radiation which propagate against the dominant direction.
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