Measurements of Coherent Cherenkov Radiation in Rock Salt: Implications   for GZK Neutrino Underground Detector
  This paper has been withdrawn by the author, due to a misunderstanding about publication. 
R. Milincic (1), P. W. Gorham (1 and 2), D. Saltzberg (3), R. C. Field   (4), G. Guillian (1), D. Walz (4), D. Williams (3) ...