| article html file updated | 6 February 2020 08:05 CET | Update | https://www.mdpi.com/2221-3759/2/1/50 |
| article html file updated | 7 May 2019 16:57 CEST | Update | - |
| article html file updated | 21 March 2019 14:19 CET | Update | - |
| article html file updated | 20 August 2015 00:43 CEST | Update | - |
| article html file updated | 24 June 2014 12:13 CEST | Original file | - |
| article xml file uploaded | 24 June 2014 12:12 CEST | Original file | https://www.mdpi.com/2221-3759/2/1/50/xml |
| article pdf uploaded. | 25 March 2014 09:07 CET | Updated version of record | https://www.mdpi.com/2221-3759/2/1/50/pdf |
| article pdf uploaded. | 21 March 2014 15:07 CET | Version of Record | https://www.mdpi.com/2221-3759/2/1/50/pdf-vor |
