| article html file updated | 8 February 2020 00:40 CET | Update | https://www.mdpi.com/2313-4321/2/1/6 |
| article html file updated | 23 September 2019 15:11 CEST | Update | N/A |
| article html file updated | 4 May 2019 08:30 CEST | Update | N/A |
| article html file updated | 3 March 2017 09:34 CET | Original file | N/A |
| article xml uploaded. | 3 March 2017 09:32 CET | Original file | https://www.mdpi.com/2313-4321/2/1/6/xml |
| article pdf uploaded. | 3 March 2017 09:32 CET | Version of Record | https://www.mdpi.com/2313-4321/2/1/6/pdf |
