| article html file updated | 6 February 2020 07:01 CET | Update | https://www.mdpi.com/2227-9040/2/1/56 |
| article html file updated | 7 May 2019 19:11 CEST | Update | N/A |
| article html file updated | 21 March 2019 11:44 CET | Update | N/A |
| article html file updated | 19 August 2015 19:04 CEST | Update | N/A |
| article html file updated | 24 June 2014 12:04 CEST | Original file | N/A |
| article xml file uploaded | 24 June 2014 12:04 CEST | Original file | https://www.mdpi.com/2227-9040/2/1/56/xml |
| article pdf uploaded. | 27 January 2014 19:05 CET | Version of Record | https://www.mdpi.com/2227-9040/2/1/56/pdf |
