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• https://vtechworks.lib.vt.edu/handle/10919/21022
• https://vtechworks.lib.vt.edu/handle/10919/61898
• https://vtechworks.lib.vt.edu/handle/10919/61899
• https://vtechworks.lib.vt.edu/handle/10919/61900
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• https://vtechworks.lib.vt.edu/handle/10919/63812
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• https://vtechworks.lib.vt.edu/handle/10919/27671
• https://vtechworks.lib.vt.edu/handle/10919/19730