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3 S. Roy, 44 : 227-233, 2007
4 S. Shukla, 4 : 553-559, 2002
5 J. Joo, 125 (125): 6553-6557, 2003
6 R. Caruso, 152 : 299-303, 2004
7 G.H. Maher, 72 (72): 72-76, 1993
8 S.D. Ramamurthi, 73 (73): 2760-2763, 1990
9 Y.C. Lee, 90 (90): 1723-1727, 2007
10 C.P. Lin, 85 (85): 129-133, 2002
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12 M. Marinsek, 23 : 119-127, 2002
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