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@article{Clark:1987,
author = "Adrian Clark",
title = "Halftone output from {\TeX}",
journal = TUB,
volume = "8",
number = "3",
year = "1987",
pages = "270--274"
}
@unpublished{Clark:1989,
author = "James Clark",
title = "{DVITOPS} User Manual",
year = "1989",
note = "unpublished machine-readable documentation"
}
@article{Clark:1991,
author = "Adrian Clark",
title = "Practical halftoning with {\TeX}",
journal = TUB,
volume = "12",
number = "1",
year = "1991",
pages = "157--165"
}
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