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• https://vtechworks.lib.vt.edu/handle/10919/20617
• https://vtechworks.lib.vt.edu/handle/10919/76766
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• https://vtechworks.lib.vt.edu/handle/10919/19060
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• https://vtechworks.lib.vt.edu/handle/10919/20613
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• https://vtechworks.lib.vt.edu/handle/10919/48712
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• https://vtechworks.lib.vt.edu/handle/10919/18993
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• https://vtechworks.lib.vt.edu/handle/10919/23790
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• https://vtechworks.lib.vt.edu/handle/10919/19203
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• https://vtechworks.lib.vt.edu/handle/10919/44992
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• https://vtechworks.lib.vt.edu/handle/10919/19368
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