| article html file updated | 8 February 2020 17:50 CET | Update | https://www.mdpi.com/2073-445X/6/4/68 |
| article html file updated | 27 September 2019 13:38 CEST | Update | - |
| article html file updated | 2 May 2019 22:39 CEST | Update | - |
| article html file updated | 2 January 2018 14:16 CET | Update | - |
| article html file updated | 9 October 2017 05:15 CEST | Original file | - |
| article xml uploaded. | 9 October 2017 05:13 CEST | Update | https://www.mdpi.com/2073-445X/6/4/68/xml |
| article xml uploaded. | 9 October 2017 05:13 CEST | Original file | - |
| article pdf uploaded. | 9 October 2017 05:13 CEST | Updated version of record | https://www.mdpi.com/2073-445X/6/4/68/pdf |
| article pdf uploaded. | 5 October 2017 16:35 CEST | Version of Record | https://www.mdpi.com/2073-445X/6/4/68/pdf-vor |
