| article html file updated | 7 February 2020 06:55 CET | Update | https://www.mdpi.com/2073-4344/6/4/55 |
| article html file updated | 5 May 2019 19:24 CEST | Update | - |
| article html file updated | 27 March 2019 01:12 CET | Update | - |
| article html file updated | 27 April 2016 11:01 CEST | Update | - |
| article html file updated | 7 April 2016 09:05 CEST | Original file | - |
| article xml uploaded. | 7 April 2016 09:04 CEST | Original file | https://www.mdpi.com/2073-4344/6/4/55/xml |
| article pdf uploaded. | 7 April 2016 09:04 CEST | Version of Record | https://www.mdpi.com/2073-4344/6/4/55/pdf |
