Geodesic equations for guided wave helical path separation for a pipe bendRasgado Moreno, Carlos Omar; Ratassepp, MadisMechanical systems and signal processing2023 / art. 110820 https://doi.org/10.1016/j.ymssp.2023.110820 Numerical assessment of guided wave tomography in a pipe bend based on full waveform inversionRasgado Moreno, Carlos Omar; Ratassepp, Madise-Journal of Nondestructive Testing (eJNDT)2023 https://www.ndt.net/?id=28371