| article html file updated | 7 February 2020 23:32 CET | Update | https://www.mdpi.com/2313-4321/2/1/4 |
| article html file updated | 23 September 2019 08:41 CEST | Update | N/A |
| article html file updated | 4 May 2019 10:59 CEST | Update | N/A |
| article html file updated | 17 February 2017 06:55 CET | Original file | N/A |
| article xml uploaded. | 17 February 2017 06:41 CET | Original file | https://www.mdpi.com/2313-4321/2/1/4/xml |
| article pdf uploaded. | 17 February 2017 06:41 CET | Updated version of record | https://www.mdpi.com/2313-4321/2/1/4/pdf |
| article pdf uploaded. | 16 February 2017 09:46 CET | Version of Record | https://www.mdpi.com/2313-4321/2/1/4/pdf-vor |
