| article html file updated | 9 February 2020 01:00 CET | Update | https://www.mdpi.com/2218-1989/8/1/2 |
| article html file updated | 29 September 2019 10:36 CEST | Update | N/A |
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| article html file updated | 26 March 2018 17:10 CEST | Update | N/A |
| article html file updated | 23 December 2017 09:45 CET | Original file | N/A |
| article xml uploaded. | 23 December 2017 09:44 CET | Original file | https://www.mdpi.com/2218-1989/8/1/2/xml |
| article pdf uploaded. | 23 December 2017 09:44 CET | Version of Record | https://www.mdpi.com/2218-1989/8/1/2/pdf |
