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Dedicated to Walter Noll on his sixtieth birthday
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Knops, R.J. Existence of weak solutions to linear indefinite systems of differential equations. Arch. Rational Mech. Anal. 98, 179–190 (1987). https://doi.org/10.1007/BF00251233
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DOI: https://doi.org/10.1007/BF00251233