Challenges - Open Access and Article Processing Charge (APC)

All articles in Challenges (ISSN 2078-1547) are published in full open access.

For Challenges (ISSN 2078-1547), there is currently no article processing charge (APC) for articles submitted in 2018.

Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


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