| article html file updated | 7 February 2020 00:27 CET | Update | https://www.mdpi.com/2218-6581/4/4/435 |
| article html file updated | 6 May 2019 07:58 CEST | Update | N/A |
| article html file updated | 26 March 2019 13:50 CET | Update | N/A |
| article html file updated | 5 November 2015 08:20 CET | Original file | N/A |
| article xml file uploaded | 5 November 2015 08:20 CET | Original file | https://www.mdpi.com/2218-6581/4/4/435/xml |
| article pdf uploaded. | 30 October 2015 17:48 CET | Version of Record | https://www.mdpi.com/2218-6581/4/4/435/pdf |
