| article html file updated | 6 February 2020 16:24 CET | Update | https://www.mdpi.com/2224-2708/4/1/30 |
| article html file updated | 7 May 2019 00:10 CEST | Update | - |
| article html file updated | 25 March 2019 22:37 CET | Update | - |
| article html file updated | 21 August 2015 08:25 CEST | Update | - |
| article html file updated | 17 March 2015 05:03 CET | Original file | - |
| article xml file uploaded | 17 March 2015 05:03 CET | Original file | https://www.mdpi.com/2224-2708/4/1/30/xml |
| article pdf uploaded. | 10 March 2015 11:48 CET | Updated version of record | https://www.mdpi.com/2224-2708/4/1/30/pdf |
| article pdf uploaded. | 9 March 2015 11:24 CET | Version of Record | https://www.mdpi.com/2224-2708/4/1/30/pdf-vor |
