| article html file updated | 8 February 2020 18:02 CET | Update | https://www.mdpi.com/2313-0105/3/4/31 |
| article html file updated | 27 September 2019 15:15 CEST | Update | - |
| article html file updated | 2 May 2019 22:13 CEST | Update | - |
| article html file updated | 10 October 2017 14:24 CEST | Original file | - |
| article xml uploaded. | 10 October 2017 14:23 CEST | Original file | https://www.mdpi.com/2313-0105/3/4/31/xml |
| article pdf uploaded. | 10 October 2017 14:23 CEST | Version of Record | https://www.mdpi.com/2313-0105/3/4/31/pdf |
