| article html file updated | 6 February 2020 22:39 CET | Update | https://www.mdpi.com/2309-608X/1/2/252 |
| article html file updated | 21 September 2019 03:10 CEST | Update | - |
| article html file updated | 6 May 2019 11:39 CEST | Update | - |
| article html file updated | 26 March 2019 10:26 CET | Update | - |
| article html file updated | 11 December 2018 08:42 CET | Original file | - |
| article pdf uploaded. | 10 September 2015 16:34 CEST | Version of Record | https://www.mdpi.com/2309-608X/1/2/252/pdf |
