| article html file updated | 7 February 2020 15:41 CET | Update | https://www.mdpi.com/2226-4310/3/4/31 |
| article html file updated | 5 May 2019 02:52 CEST | Update | - |
| article html file updated | 28 December 2016 11:27 CET | Update | - |
| article html file updated | 28 September 2016 23:06 CEST | Original file | - |
| article xml uploaded. | 28 September 2016 10:02 CEST | Update | https://www.mdpi.com/2226-4310/3/4/31/xml |
| article xml uploaded. | 28 September 2016 10:02 CEST | Original file | - |
| article pdf uploaded. | 28 September 2016 10:02 CEST | Version of Record | https://www.mdpi.com/2226-4310/3/4/31/pdf |
