Send the following on WhatsApp
Continue to ChatOn the tubular surfaces in E3 - https://avesis.atauni.edu.tr/yayin/688e0620-ea98-4318-89b8-7653dd41ad98/on-the-tubular-surfaces-in-e3
On the tubular surfaces in E3 - https://avesis.atauni.edu.tr/yayin/688e0620-ea98-4318-89b8-7653dd41ad98/on-the-tubular-surfaces-in-e3