| article html file updated | 6 February 2020 02:29 CET | Update | https://www.mdpi.com/2072-6643/5/6/1989 |
| article html file updated | 8 May 2019 04:23 CEST | Update | - |
| article html file updated | 20 March 2019 23:25 CET | Update | - |
| article html file updated | 17 June 2015 09:58 CEST | Update | - |
| article html file updated | 6 August 2013 15:58 CEST | Original file | - |
| article xml file uploaded | 6 August 2013 15:58 CEST | Original file | https://www.mdpi.com/2072-6643/5/6/1989/xml |
| article pdf uploaded. | 4 June 2013 14:04 CEST | Version of Record | https://www.mdpi.com/2072-6643/5/6/1989/pdf |
