1. Y.-C. Choi, T.-J. Park, J.-H. Kim, J.-G. Lee, J.-C. Hong, and Y.-G. Kim, Korean J. Chem. Eng., 18, 493 (2001).
2. C.-K. Yi, S.-H. Jo, B.-H. Lee, S.-Y. Lee, and J.-E. Son, Korean J. Chem. Eng., 18, 1005 (2001).
3. R. Gupta, B. Turk, and M. Lesemann, 2009 Gasification Tecnlologies Conference, Colorado, USA (2009).
4. M. Hornick and B. Gardner, 2011 Gasification Technologies Conference, San Francisco, USA (2011).
5. C.-K. Yi, S.-H. Jo, H.-S. Kwon, K.-B. Kim, H.-K. Chae, G.-T. Jin, and J.-E. Son, Korean Chem. Eng. Res., 40, 246 (2002).