NDP is an open access journal which means that all content is freely available Online without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is in accordance with the BOAI definition of open access.
Open access is an advantage to all scientific community. But with advantage, there is more responsibilities. We follow ethical publishing guidelines defined by organizations as DOAJ(Redirect to https://doaj.org/), OASPA(https://oaspa.org/), WAME (http://www.wame.org/) and ICMJE (http://www.icmje.org/).