| article html file updated | 9 February 2020 17:49 CET | Update | https://www.mdpi.com/2227-9091/6/2/56 |
| article html file updated | 3 October 2019 15:45 CEST | Update | N/A |
| article html file updated | 30 April 2019 19:20 CEST | Update | N/A |
| article html file updated | 16 April 2019 19:47 CEST | Update | N/A |
| article html file updated | 30 March 2019 01:23 CET | Update | N/A |
| article html file updated | 27 June 2018 10:03 CEST | Update | N/A |
| article html file updated | 16 May 2018 12:11 CEST | Original file | N/A |
| article pdf uploaded. | 16 May 2018 12:10 CEST | Version of Record | https://www.mdpi.com/2227-9091/6/2/56/pdf |
| article xml uploaded. | 16 May 2018 12:10 CEST | Update | https://www.mdpi.com/2227-9091/6/2/56/xml |
| article xml file uploaded | 16 May 2018 12:10 CEST | Original file | N/A |
