REFERENCES
- Peter , Susy , Panigrahi , B. S. , Viswanathan , K. S. and Mathews , C. K. 1992 . Anal. Chim. Acta. , 260 ( 1 ) : 135 – 41 .
- Liu , Shaorong and Meng , Jian . 1992 . Anal. Chim. Acta. , 266 ( 1 ) : 67 – 71 .
- Yang , Jinghe. , Zhu , Guiyun. and Wang , Hong. 1989 . Analyst (London) , 114 ( 11 ) : 1417 – 19 .
- Ci , Yunxiang and Lan , Zhanghua . 1989 . Anal. Chem. , 61 ( 10 ) : 1063 – 9 .
- Xu , Rongyuan and Ilkka Hemmia , A. 1992 . Anal. Chim. Acta. , 256 ( 1 ) : 9 – 16 .
- Zhu , Guiyun , Si , Zhikun , Jiang , Wei , Li , Wei and Li , Jie . 1992 . Spectrochim. Acta. Part A. , 48A ( 7 ) : 1009 – 13 .
- Panigrahi , B. S. , Peter , Susy , Viswanathan , K. S. and Mathews , C. K. 1993 . Anal. Chim. Acta. , 292 ( 1 ) : 117 – 24 .
- Kononenko , L. I. , Mishchenko , S. A. and Poluetkov , N. S. 1966 . Zh. Anal. Khim. , 21 ( 11 ) : 1392 – 4 .