| article html file updated | 6 February 2020 23:00 CET | Update | https://www.mdpi.com/2076-0787/4/3/457 |
| article html file updated | 6 May 2019 10:54 CEST | Update | - |
| article html file updated | 26 March 2019 11:09 CET | Update | - |
| article html file updated | 12 October 2015 11:48 CEST | Original file | - |
| article xml file uploaded | 12 October 2015 11:48 CEST | Original file | https://www.mdpi.com/2076-0787/4/3/457/xml |
| article pdf uploaded. | 21 September 2015 09:49 CEST | Updated version of record | https://www.mdpi.com/2076-0787/4/3/457/pdf |
| article pdf uploaded. | 18 September 2015 17:00 CEST | Version of Record | https://www.mdpi.com/2076-0787/4/3/457/pdf-vor |
