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Submitted on: 13 September 2012.
Revised on: 16 October 2012.
Accepted on: 31 October 2012.
TOPOLOGY AND ITS APPLICATIONS---ELSEVIER
Submitted on: 30 August 2018.
Revised on: 22 September 2018.
Accepted on: 13 October 2018.
TOPOLOGY AND ITS APPLICATIONS
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