| article html file updated | 6 February 2020 16:48 CET | Update | https://www.mdpi.com/2220-9964/4/1/400 |
| article html file updated | 6 May 2019 23:25 CEST | Update | - |
| article html file updated | 25 March 2019 23:17 CET | Update | - |
| article html file updated | 21 August 2015 09:05 CEST | Original file | - |
| article pdf uploaded. | 19 March 2015 15:19 CET | Version of Record | https://www.mdpi.com/2220-9964/4/1/400/pdf |
