| article html file updated | 7 February 2020 06:34 CET | Update | https://www.mdpi.com/2073-4344/6/4/52 |
| article html file updated | 5 May 2019 20:05 CEST | Update | - |
| article html file updated | 27 March 2019 00:36 CET | Update | - |
| article html file updated | 27 April 2016 11:00 CEST | Update | - |
| article html file updated | 29 March 2016 12:44 CEST | Original file | - |
| article xml uploaded. | 29 March 2016 12:42 CEST | Update | https://www.mdpi.com/2073-4344/6/4/52/xml |
| article pdf uploaded. | 29 March 2016 12:42 CEST | Version of Record | https://www.mdpi.com/2073-4344/6/4/52/pdf |
