Underground polymeric l-shaped pipeline vibrations under seismic effectNematilla Nishonov, Diyorbek Bekmirzaev, Akbar Ergashov, Ziyoviddin Rakhimjonov and Asror KhurramovE3S Web Conf., 264 (2021) 02037DOI: https://doi.org/10.1051/e3sconf/202126402037