| article html file updated | 7 February 2020 02:43 CET | Update | https://www.mdpi.com/2073-4352/6/1/4 |
| article html file updated | 6 May 2019 03:57 CEST | Update | N/A |
| article html file updated | 26 March 2019 17:15 CET | Original file | N/A |
| article pdf uploaded. | 25 December 2015 07:27 CET | Version of Record | https://www.mdpi.com/2073-4352/6/1/4/pdf |
| article xml uploaded. | 25 December 2015 07:27 CET | Original file | https://www.mdpi.com/2073-4352/6/1/4/xml |
