References
- C. H. Hwang, Korea patent, 15651 (2006)
- C. H. Hwang, Korea patent, 15694 (2006)
- C. H. Hwang, Korea patent, 15701 (2006)
- C. H. Hwang, Korea patent, 15712 (2006)
- C. H. Hwang, Korea patent, 20374 (2006)
- C. C. Hwang, in SID '06 (2006), vol. 47.3 p. 1567