@inbook{72e757713a504a5e86144f91238b0737,
title = "Sharp energy estimates for a class of weakly hyperbolic operators",
author = "Michael Dreher and Ingo Witt",
note = "Series Subtitle - Advances in Partial Differential Equations",
year = "2005",
doi = "10.1007/3-7643-7386-5_6",
language = "English",
isbn = "978-3-7643-7283-5",
volume = "159",
series = "Operator Theory: Advances and Applications",
publisher = "Birkh{\"a}user",
pages = "449--511",
editor = "Reissig, {Michael } and Schulze, {Bert-Wolfgang }",
booktitle = "New Trends in the Theory of Hyperbolic Equations",
address = "Switzerland",
}