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8 records were found.

Comment: 23 pages, 2 figures; v2 references added
Comment: 23 pages, 9 figures; corrected typos and added references; JHEP version, corrected one mistake, few typos and added references
Comment: 33 pages, 7 figures; references added, minor corrections [v2]; version to appear in JHEP [v3]
Comment: 13 pages; version accepted for publication on Phys. Lett. B
Comment: v1- 6 pages, 1 figure; v2- version published on PRD
Comment: 14 LaTex pages, 3 refs with comments added; PLB version
Comment: 17 pages, 9 figures; v2 references with comments added; v3 two references added, JHEP version
We present an example of a gauge-invariant Lagrangian that contains four derivatives and describes one massive, non-ghostlike, degree of freedom.
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