In the case of this journal:
The authors
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do not pay or receive any fees for the publication,
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the electronic version of the journal can be downloaded and printed for free,
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can upload to any electronic surfaces without change,
The readers
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can download and print the electronic version of the studies,
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for partial or full use of the study proper reference is obligatory.
The Journal uses a "green" archiving policy: archive preprint and postprint (final, verified manuscript) or publishing version / PDF.
All issues of the journal are open access, the papers are free to download!