| article html file updated | 7 February 2020 07:06 CET | Update | https://www.mdpi.com/2225-1154/4/2/21 |
| article html file updated | 5 May 2019 18:58 CEST | Update | N/A |
| article html file updated | 27 March 2019 01:33 CET | Update | N/A |
| article html file updated | 1 July 2016 10:40 CEST | Update | N/A |
| article html file updated | 11 April 2016 13:17 CEST | Original file | N/A |
| article xml uploaded. | 11 April 2016 13:15 CEST | Original file | https://www.mdpi.com/2225-1154/4/2/21/xml |
| article pdf uploaded. | 11 April 2016 13:15 CEST | Version of Record | https://www.mdpi.com/2225-1154/4/2/21/pdf |
