9Cross N O. On stream high temperature wall thickness measuring stud[C]. Proceedings of the 7th symposium, Nondestructive Evaluation of Components and Materials in Aerospace Weapons Systems and Nuclear Applications. San Antonio[s. n. ], 1969.
10Youngdahl C A, Ellingson W A. Nondestructive monitoring of erosive wear at synfuels pilot plants [J]. Material Performance, 1985,24 (1) : 48-53.