| article html file updated | 6 February 2020 04:37 CET | Update | https://www.mdpi.com/2220-9964/2/4/908 |
| article html file updated | 7 May 2019 23:56 CEST | Update | N/A |
| article html file updated | 21 March 2019 05:11 CET | Update | N/A |
| article html file updated | 17 June 2015 13:31 CEST | Update | N/A |
| article html file updated | 10 November 2014 07:33 CET | Original file | N/A |
| article xml file uploaded | 10 November 2014 07:33 CET | Original file | https://www.mdpi.com/2220-9964/2/4/908/xml |
| article pdf uploaded. | 27 September 2013 14:52 CEST | Version of Record | https://www.mdpi.com/2220-9964/2/4/908/pdf |
