Submitted on: 15 January 2006.
Revised on: 23 February 2006.
Accepted on: 12 March 2006.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA
Submitted on: 30 April 2018.
Revised on: 31 May 2018.
Accepted on: 09 June 2018.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA
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http://reply.papertrans.cn/3/253/25261/25261-34.png
Submitted on: 11 February 2002.
Revised on: 20 February 2002.
Accepted on: 17 March 2002.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA
Submitted on: 15 June 2013.
Revised on: 08 July 2013.
Accepted on: 14 July 2013.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA