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Answer» What is Publisher Item Identifier mean? The Publisher Item Identifier (PII) is a unique identifier used by a number of scientific journal publishers to identify documents. It uses the pre-existing ISSN or ISBN of the publication in question, and adds a character for source publication type, an item number, and a check digit. The system was adopted in 1996 by the American Chemical Society, theAmerican Institute of Physics, the American Physical Society,Elsevier Science, and the IEEE. reference
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