| article html file updated | 6 February 2020 03:27 CET | Update | https://www.mdpi.com/2076-0817/2/3/506 |
| article html file updated | 8 May 2019 02:25 CEST | Update | N/A |
| article html file updated | 21 March 2019 01:59 CET | Update | N/A |
| article html file updated | 17 June 2015 11:46 CEST | Update | N/A |
| article html file updated | 26 August 2014 04:23 CEST | Original file | N/A |
| article xml file uploaded | 26 August 2014 04:23 CEST | Original file | https://www.mdpi.com/2076-0817/2/3/506/xml |
| article pdf uploaded. | 25 July 2013 15:34 CEST | Version of Record | https://www.mdpi.com/2076-0817/2/3/506/pdf |
