| article html file updated | 7 February 2020 06:51 CET | Update | https://www.mdpi.com/2073-4352/6/4/39 |
| article html file updated | 5 May 2019 19:32 CEST | Update | N/A |
| article html file updated | 27 March 2019 01:05 CET | Update | N/A |
| article html file updated | 27 April 2016 11:05 CEST | Update | N/A |
| article html file updated | 6 April 2016 09:29 CEST | Original file | N/A |
| article xml uploaded. | 6 April 2016 09:28 CEST | Original file | https://www.mdpi.com/2073-4352/6/4/39/xml |
| article pdf uploaded. | 6 April 2016 09:28 CEST | Version of Record | https://www.mdpi.com/2073-4352/6/4/39/pdf |
