| article html file updated | 6 February 2020 07:41 CET | Update | https://www.mdpi.com/2076-0787/3/1/73 |
| article html file updated | 20 September 2019 06:20 CEST | Update | N/A |
| article html file updated | 7 May 2019 17:46 CEST | Update | N/A |
| article html file updated | 21 March 2019 13:22 CET | Update | N/A |
| article html file updated | 21 March 2017 04:14 CET | Original file | N/A |
| article pdf uploaded. | 11 March 2014 14:29 CET | Updated version of record | https://www.mdpi.com/2076-0787/3/1/73/pdf |
| article pdf uploaded. | 5 March 2014 09:21 CET | Version of Record | https://www.mdpi.com/2076-0787/3/1/73/pdf-vor |
