| article html file updated | 9 February 2020 04:57 CET | Update | https://www.mdpi.com/2218-1997/4/2/23 |
| article html file updated | 30 September 2019 09:05 CEST | Update | N/A |
| article html file updated | 1 May 2019 22:15 CEST | Update | N/A |
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| article html file updated | 14 March 2018 09:43 CET | Update | N/A |
| article html file updated | 31 January 2018 04:43 CET | Original file | N/A |
| article xml uploaded. | 31 January 2018 04:42 CET | Original file | https://www.mdpi.com/2218-1997/4/2/23/xml |
| article pdf uploaded. | 31 January 2018 04:42 CET | Version of Record | https://www.mdpi.com/2218-1997/4/2/23/pdf |
