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Submitted on: 04 March 2000.
Revised on: 28 June 2000.
Accepted on: 12 July 2000.
___________________JOURNAL OF APICULTURAL RESEARCH
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http://reply.papertrans.cn/2/153/15275/15275-34.png
Submitted on: 21 March 2002.
Revised on: 09 July 2002.
Accepted on: 02 September 2002.
___________________JOURNAL OF APICULTURAL RESEARCH
Submitted on: 12 June 2002.
Revised on: 09 August 2002.
Accepted on: 25 September 2002.
___________________JOURNAL OF APICULTURAL RESEARCH