| article html file updated | 9 February 2020 01:59 CET | Update | https://www.mdpi.com/2218-1997/4/1/12 |
| article html file updated | 29 September 2019 16:09 CEST | Update | - |
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| article html file updated | 1 February 2018 11:50 CET | Update | - |
| article pdf uploaded. | 5 January 2018 10:29 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/12/pdf |
| article html file updated | 4 January 2018 10:20 CET | Original file | - |
| article xml uploaded. | 4 January 2018 10:19 CET | Original file | https://www.mdpi.com/2218-1997/4/1/12/xml |
| article pdf uploaded. | 4 January 2018 10:19 CET | Version of Record | https://www.mdpi.com/2218-1997/4/1/12/pdf-vor |
