| article html file updated | 7 February 2020 06:58 CET | Update | https://www.mdpi.com/2077-1312/4/2/30 |
| article html file updated | 5 May 2019 19:17 CEST | Update | - |
| article html file updated | 27 March 2019 01:19 CET | Update | - |
| article html file updated | 27 October 2017 11:17 CEST | Update | - |
| article html file updated | 8 April 2016 09:42 CEST | Original file | - |
| article xml uploaded. | 8 April 2016 09:40 CEST | Original file | https://www.mdpi.com/2077-1312/4/2/30/xml |
| article pdf uploaded. | 8 April 2016 09:40 CEST | Version of Record | https://www.mdpi.com/2077-1312/4/2/30/pdf |
