Achmad Widodo, Bo-Suk Yang, Eric Y. Kim, Andy C. C. Tan and Joseph Mathew
Nondestructive Testing and Evaluation 24 ( 4 ): 313 - 328 , 2009
Ali Md. Younus, Achmad Widodo and Bo-Suk Yang
Nondestructive Testing and Evaluation 25 ( 3 ): 231 - 247 , 2010