| article html file updated | 6 February 2020 07:37 CET | Update | https://www.mdpi.com/2079-9268/4/1/63 |
| article html file updated | 7 May 2019 17:55 CEST | Update | N/A |
| article html file updated | 21 March 2019 13:12 CET | Update | N/A |
| article html file updated | 20 January 2017 03:28 CET | Original file | N/A |
| article pdf uploaded. | 28 February 2014 14:29 CET | Version of Record | https://www.mdpi.com/2079-9268/4/1/63/pdf |
