| article html file updated | 7 February 2020 08:46 CET | Update | https://www.mdpi.com/2075-1729/6/2/20 |
| article html file updated | 5 May 2019 15:41 CEST | Update | N/A |
| article html file updated | 27 March 2019 04:49 CET | Update | N/A |
| article html file updated | 4 July 2016 10:33 CEST | Update | N/A |
| article html file updated | 16 May 2016 12:04 CEST | Original file | N/A |
| article xml uploaded. | 16 May 2016 12:03 CEST | Original file | https://www.mdpi.com/2075-1729/6/2/20/xml |
| article pdf uploaded. | 16 May 2016 12:03 CEST | Version of Record | https://www.mdpi.com/2075-1729/6/2/20/pdf |
