| article html file updated | 6 February 2020 08:18 CET | Update | https://www.mdpi.com/2079-6382/3/2/121 |
| article html file updated | 7 May 2019 16:30 CEST | Update | N/A |
| article html file updated | 21 March 2019 14:50 CET | Original file | N/A |
| article pdf uploaded. | 4 April 2014 16:21 CEST | Updated version of record | https://www.mdpi.com/2079-6382/3/2/121/pdf |
| article pdf uploaded. | 2 April 2014 08:40 CEST | Version of Record | https://www.mdpi.com/2079-6382/3/2/121/pdf-vor |
