| article html file updated | 6 February 2020 07:58 CET | Update | https://www.mdpi.com/1999-4923/6/1/137 |
| article html file updated | 7 May 2019 17:11 CEST | Update | N/A |
| article html file updated | 21 March 2019 14:02 CET | Update | N/A |
| article html file updated | 20 August 2015 00:08 CEST | Update | N/A |
| article html file updated | 28 April 2014 11:08 CEST | Original file | N/A |
| article xml file uploaded | 28 April 2014 11:07 CEST | Original file | https://www.mdpi.com/1999-4923/6/1/137/xml |
| article pdf uploaded. | 18 March 2014 10:50 CET | Version of Record | https://www.mdpi.com/1999-4923/6/1/137/pdf |
