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Submitted on: 11 September 2015.
Revised on: 07 October 2015.
Accepted on: 21 October 2015.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA
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Submitted on: 22 April 2000.
Revised on: 16 May 2000.
Accepted on: 09 June 2000.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA
Submitted on: 24 May 1999.
Revised on: 22 June 1999.
Accepted on: 02 July 1999.
PROCEEDINGS OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA