K. H. Ong

A robust focusing and astigmatism correction method for the scanning electron microscope—Part III: An improved technique

John T. L. Thong, Jacob C. H. Phang, K. H. Ong, 1998 .

A robust focusing and astigmatism correction method for the scanning electron microscope

K. H. Ong, J. Thong, J. Phang, 2006 .

A robust focusing and astigmatism correction method for the scanning electron microscope—Part II: Autocorrelation-based coarse focusing method

John T. L. Thong, K. H. Ong, Jacob C. H. Phang, 1998 .