| article html file updated | 9 February 2020 01:55 CET | Update | https://www.mdpi.com/2218-1997/4/1/9 |
| article html file updated | 29 September 2019 15:50 CEST | Update | - |
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| article html file updated | 1 February 2018 11:49 CET | Update | - |
| article pdf uploaded. | 23 January 2018 06:42 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/9/pdf |
| article html file updated | 22 January 2018 11:01 CET | Update | - |
| article xml uploaded. | 22 January 2018 10:59 CET | Update | https://www.mdpi.com/2218-1997/4/1/9/xml |
| article pdf uploaded. | 22 January 2018 10:59 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/9/pdf-vor |
| article html file updated | 5 January 2018 10:29 CET | Update | - |
| article pdf uploaded. | 5 January 2018 10:28 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/9/pdf-vor |
| article html file updated | 3 January 2018 15:17 CET | Original file | - |
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