| article html file updated | 7 February 2020 22:50 CET | Update | https://www.mdpi.com/2218-1997/3/1/8 |
| article html file updated | 23 September 2019 04:53 CEST | Update | - |
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| article xml uploaded. | 8 February 2017 12:53 CET | Original file | https://www.mdpi.com/2218-1997/3/1/8/xml |
| article pdf uploaded. | 8 February 2017 12:53 CET | Version of Record | https://www.mdpi.com/2218-1997/3/1/8/pdf |
