| article html file updated | 6 February 2020 07:11 CET | Update | https://www.mdpi.com/2227-7080/2/1/31 |
| article html file updated | 7 May 2019 18:48 CEST | Update | N/A |
| article html file updated | 21 March 2019 12:09 CET | Update | N/A |
| article html file updated | 19 August 2015 19:58 CEST | Update | N/A |
| article html file updated | 24 June 2014 12:27 CEST | Original file | N/A |
| article xml file uploaded | 24 June 2014 12:27 CEST | Original file | https://www.mdpi.com/2227-7080/2/1/31/xml |
| article pdf uploaded. | 10 February 2014 15:15 CET | Version of Record | https://www.mdpi.com/2227-7080/2/1/31/pdf |
