Ma’arif, F., Widodo, S., Nugroho, M.S., Tafrikan, M. and Gao, Z. 2022. The Ultrasonic Pulse Velocity and Lagrangian Approaches to Predict the Effective Thickness and Homogeneity of the Sandwich Panel. UKaRsT. 6, 2 (Nov. 2022), 246–260. DOI:https://doi.org/10.30737/ukarst.v6i2.3545.