3 lines
128 B
Plaintext
3 lines
128 B
Plaintext
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http://msp.org/apde/2012/5-2/apde-v5-n2-p07-s.pdf
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http://www.ems-ph.org/journals/show_pdf.php?issn=1661-7207&vol=5&iss=2&rank=6
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