| article html file updated | 6 February 2020 15:09 CET | Update | https://www.mdpi.com/2227-9040/3/1/21 |
| article html file updated | 7 May 2019 02:31 CEST | Update | - |
| article html file updated | 25 March 2019 20:28 CET | Update | - |
| article html file updated | 21 August 2015 05:44 CEST | Update | - |
| article html file updated | 20 January 2015 08:37 CET | Original file | - |
| article xml file uploaded | 20 January 2015 08:37 CET | Original file | https://www.mdpi.com/2227-9040/3/1/21/xml |
| article pdf uploaded. | 13 January 2015 16:23 CET | Updated version of record | https://www.mdpi.com/2227-9040/3/1/21/pdf |
| article pdf uploaded. | 13 January 2015 16:18 CET | Version of Record | - |
