J. Korean Math. Soc. 2003; 40(1): 61-72
Printed January 1, 2003
Copyright © The Korean Mathematical Society.
Changrim Jang, Junkon Kim, Yeonwook Kim, and Keun Park
University of Ulsan, Hwamyung High School, University of Ulsan, University of Ulsan,
2008; 45(6): 1705-1723
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