• https://vtechworks.lib.vt.edu/items/8f39b688-5e97-42db-8913-b80364eb778e
• https://vtechworks.lib.vt.edu/items/b274a2f1-58a6-4f68-bd14-ba19242558cb
• https://vtechworks.lib.vt.edu/items/88828834-3dd3-4651-8e7e-0a2d6fcbf505
• https://vtechworks.lib.vt.edu/items/83c316d7-53b3-4110-8555-5da988128413
• https://vtechworks.lib.vt.edu/items/a66d0d0d-f6e7-4d2e-b6cb-a55f4e3693c1
• https://vtechworks.lib.vt.edu/items/d5ab7911-8506-4e66-b61f-c47a4b326fa6
• https://vtechworks.lib.vt.edu/items/1069f143-80d0-4467-82e9-928b803521e7
• https://vtechworks.lib.vt.edu/items/c750aa68-52d8-41ff-b93b-f4d6f540f9fa
• https://vtechworks.lib.vt.edu/items/c0c8b052-f22b-49bf-906d-ac6558533120