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@Article{Knill:1991:ULE, author = "Oliver Knill", title = "The upper {Lyapunov} exponent of {$ {\rm Sl}(2, R) $} cocycles: Discontinuity and the problem of positivity", journal = j-LECT-NOTES-MATH, volume = "1486", pages = "86--97", year = "1991", CODEN = "LNMAA2", DOI = "https://doi.org/10.1007/BFb0086660", ISBN = "3-540-54662-6 (print), 3-540-46431-X (e-book)", ISBN-13 = "978-3-540-54662-7 (print), 978-3-540-46431-0 (e-book)", ISSN = "0075-8434 (print), 1617-9692 (electronic)", ISSN-L = "0075-8434", MRclass = "58F11 (28D20)", MRnumber = "1178949 (93g:58081)", MRreviewer = "Manfred Denker", bibdate = "Fri May 9 19:07:21 MDT 2014", bibsource = "http://www.math.utah.edu/pub/tex/bib/lnm1990.bib", URL = "http://link.springer.com/chapter/10.1007/BFb0086660/", acknowledgement = ack-nhfb, book-DOI = "https://doi.org/10.1007/BFb0086653", book-URL = "http://www.springerlink.com/content/978-3-540-46431-0", fjournal = "Lecture Notes in Mathematics", journal-URL = "http://link.springer.com/bookseries/304", }