| article html file updated | 6 February 2020 18:37 CET | Update | https://www.mdpi.com/2227-9040/3/2/146 |
| article html file updated | 6 May 2019 20:04 CEST | Update | - |
| article html file updated | 26 March 2019 02:36 CET | Update | - |
| article html file updated | 21 August 2015 12:08 CEST | Original file | - |
| article pdf uploaded. | 18 May 2015 15:53 CEST | Updated version of record | https://www.mdpi.com/2227-9040/3/2/146/pdf |
| article pdf uploaded. | 14 May 2015 09:17 CEST | Version of Record | https://www.mdpi.com/2227-9040/3/2/146/pdf-vor |
