Vigne, G., Jönsson, J., & Hacar, F. (2014). Tunnels with rough walls and cavities. Universidad Pedagógica y Tecnológica de Colombia - UPTC.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVigne, Gabriele, Jimmy Jönsson, और Fernando Hacar. Tunnels with Rough Walls and Cavities. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVigne, Gabriele, et al. Tunnels with Rough Walls and Cavities. Universidad Pedagógica y Tecnológica de Colombia - UPTC, 2014.
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