| article html file updated | 8 February 2020 22:01 CET | Update | https://www.mdpi.com/2218-1997/3/4/81 |
| article html file updated | 28 September 2019 16:55 CEST | Update | - |
| article html file updated | 2 May 2019 13:07 CEST | Update | - |
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| article html file updated | 2 January 2018 14:46 CET | Update | - |
| article html file updated | 21 December 2017 03:34 CET | Update | - |
| article xml uploaded. | 21 December 2017 03:33 CET | Update | https://www.mdpi.com/2218-1997/3/4/81/xml |
| article xml uploaded. | 21 December 2017 03:33 CET | Update | - |
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| article pdf uploaded. | 21 December 2017 03:33 CET | Updated version of record | https://www.mdpi.com/2218-1997/3/4/81/pdf |
| article html file updated | 23 November 2017 15:25 CET | Original file | - |
| article xml uploaded. | 23 November 2017 15:24 CET | Original file | - |
| article pdf uploaded. | 23 November 2017 15:24 CET | Version of Record | https://www.mdpi.com/2218-1997/3/4/81/pdf-vor |
