| article html file updated | 6 February 2020 19:39 CET | Update | https://www.mdpi.com/2227-7390/3/2/487 |
| article html file updated | 6 May 2019 17:50 CEST | Update | N/A |
| article html file updated | 26 March 2019 04:41 CET | Update | N/A |
| article html file updated | 21 August 2015 13:35 CEST | Update | N/A |
| article html file updated | 24 July 2015 08:40 CEST | Original file | N/A |
| article xml file uploaded | 24 July 2015 08:40 CEST | Original file | https://www.mdpi.com/2227-7390/3/2/487/xml |
| article pdf uploaded. | 12 June 2015 13:59 CEST | Version of Record | https://www.mdpi.com/2227-7390/3/2/487/pdf |
