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@article{Katai&Kovacs:1981,
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@techreport{Davio&Deschamps&Gossart:1978,
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	author = "M. Davio and J. P. Deschamps and C. Gossart",
	title = "Complex arithmetic",
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	year = 1978}

@article{Gilbert:1996,
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@incollection{Frougny:1996,
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@article{Thuswaldner:2000,
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@article{Thuswaldner:1998b,
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