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| article html file updated | 13 March 2018 10:54 CET | Original file | N/A |
| article xml uploaded. | 13 March 2018 10:53 CET | Original file | https://www.mdpi.com/2218-1997/4/3/54/xml |
| article pdf uploaded. | 13 March 2018 10:53 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/3/54/pdf |
| article pdf uploaded. | 12 March 2018 17:37 CET | Version of Record | https://www.mdpi.com/2218-1997/4/3/54/pdf-vor |
