1. Ultrasonic Nondestructive Bond Evaluation: An Analysis of the Problem;Chaskelis;Mater. Eval.,1980
2. Ultrasonic Testing of Material;Krautkrämer,1977
3. On the Propagation of Ultrasonic Energy Through Thin Air Layers;Tarnóczy,1956
4. Ultrasound Penetration Through Very Thin Gas Layers Embedded in Solid Bodies;Szilárd,1963
5. Ultrasonic Interactions With Thin Air Layers in Solids;Gustafson,1978