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), pp. 246–260. doi: 10.30737/ukarst.v6i2.3545.