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http://lena.franken.de/hardware/temperaturmessung.html
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http://www.rowetel.com/blog/?p=27
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http://qucs.sourceforge.net/index.html
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http://www.nuhorizons.com/xilinx/boards/spartan-3/SP3eStarterKit/index.asp
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http://www.bunniestudios.com/blog/?p=611