| article html file updated | 6 February 2020 13:55 CET | Update | https://www.mdpi.com/2226-4787/2/4/270 |
| article html file updated | 20 September 2019 15:15 CEST | Update | N/A |
| article html file updated | 7 May 2019 04:58 CEST | Update | N/A |
| article html file updated | 25 March 2019 18:17 CET | Update | N/A |
| article html file updated | 21 August 2015 02:41 CEST | Original file | N/A |
| article pdf uploaded. | 26 November 2014 08:16 CET | Updated version of record | https://www.mdpi.com/2226-4787/2/4/270/pdf |
| article pdf uploaded. | 25 November 2014 16:20 CET | Version of Record | https://www.mdpi.com/2226-4787/2/4/270/pdf-vor |
