| article html file updated | 6 February 2020 14:14 CET | Update | https://www.mdpi.com/2079-9276/3/4/721 |
| article html file updated | 7 May 2019 04:23 CEST | Update | - |
| article html file updated | 25 March 2019 18:52 CET | Update | - |
| article html file updated | 21 August 2015 03:37 CEST | Update | - |
| article html file updated | 30 December 2014 09:33 CET | Original file | - |
| article xml file uploaded | 30 December 2014 09:33 CET | Original file | https://www.mdpi.com/2079-9276/3/4/721/xml |
| article pdf uploaded. | 8 December 2014 16:59 CET | Updated version of record | https://www.mdpi.com/2079-9276/3/4/721/pdf |
| article pdf uploaded. | 5 December 2014 15:28 CET | Version of Record | https://www.mdpi.com/2079-9276/3/4/721/pdf-vor |
