| article html file updated | 7 February 2020 21:34 CET | Update | https://www.mdpi.com/2313-0105/3/1/2 |
| article html file updated | 4 May 2019 15:01 CEST | Update | - |
| article html file updated | 17 January 2017 06:42 CET | Original file | - |
| article xml uploaded. | 17 January 2017 06:41 CET | Original file | https://www.mdpi.com/2313-0105/3/1/2/xml |
| article pdf uploaded. | 17 January 2017 06:41 CET | Version of Record | https://www.mdpi.com/2313-0105/3/1/2/pdf |
