| article html file updated | 7 February 2020 11:15 CET | Update | https://www.mdpi.com/2304-6740/4/3/21 |
| article html file updated | 5 May 2019 10:57 CEST | Update | - |
| article html file updated | 27 March 2019 09:26 CET | Update | - |
| article html file updated | 28 September 2016 10:53 CEST | Update | - |
| article html file updated | 5 July 2016 13:42 CEST | Original file | - |
| article xml uploaded. | 5 July 2016 13:41 CEST | Original file | https://www.mdpi.com/2304-6740/4/3/21/xml |
| article pdf uploaded. | 5 July 2016 13:41 CEST | Version of Record | https://www.mdpi.com/2304-6740/4/3/21/pdf |
