| article html file updated | 7 February 2020 09:41 CET | Update | https://www.mdpi.com/2077-1312/4/2/40 |
| article html file updated | 5 May 2019 13:51 CEST | Update | - |
| article html file updated | 27 March 2019 06:33 CET | Update | - |
| article html file updated | 27 October 2017 11:20 CEST | Update | - |
| article html file updated | 3 June 2016 08:56 CEST | Original file | - |
| article xml uploaded. | 3 June 2016 08:54 CEST | Update | https://www.mdpi.com/2077-1312/4/2/40/xml |
| article pdf uploaded. | 3 June 2016 08:54 CEST | Version of Record | https://www.mdpi.com/2077-1312/4/2/40/pdf |
