| article html file updated | 6 February 2020 09:02 CET | Update | https://www.mdpi.com/2218-273X/4/2/474 |
| article html file updated | 7 May 2019 14:58 CEST | Update | N/A |
| article html file updated | 21 March 2019 16:34 CET | Update | N/A |
| article html file updated | 14 March 2018 13:27 CET | Update | N/A |
| article html file updated | 20 August 2015 05:47 CEST | Update | N/A |
| article html file updated | 18 July 2014 03:56 CEST | Original file | N/A |
| article xml file uploaded | 18 July 2014 03:56 CEST | Original file | https://www.mdpi.com/2218-273X/4/2/474/xml |
| article pdf uploaded. | 5 May 2014 15:53 CEST | Version of Record | https://www.mdpi.com/2218-273X/4/2/474/pdf |
