JPPPF Volume 5 Issue 1 contains seven articles.

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Dear all authors and readers of JPPPF, 

We apologize specifically Number 1 Year 2019 JPPPF published on 30 July 2019, because there are server upgrades and service improvements in the OJS system at the UNJ Journal portal during May-June 2019.

DOI: https://doi.org/10.21009/1.051
Published: 2019-07-30

Editorial Section

Articles