| article html file updated | 7 February 2020 07:00 CET | Update | https://www.mdpi.com/2077-1312/4/2/31 |
| article html file updated | 5 May 2019 19:13 CEST | Update | - |
| article html file updated | 27 March 2019 01:21 CET | Update | - |
| article html file updated | 27 October 2017 11:18 CEST | Update | - |
| article html file updated | 8 April 2016 13:07 CEST | Original file | - |
| article xml uploaded. | 8 April 2016 13:05 CEST | Update | https://www.mdpi.com/2077-1312/4/2/31/xml |
| article pdf uploaded. | 8 April 2016 13:05 CEST | Version of Record | https://www.mdpi.com/2077-1312/4/2/31/pdf |
