| article html file updated | 8 February 2020 02:47 CET | Update | https://www.mdpi.com/2224-2708/6/2/4 |
| article html file updated | 24 September 2019 03:18 CEST | Update | N/A |
| article html file updated | 4 May 2019 03:51 CEST | Update | N/A |
| article html file updated | 29 June 2017 11:33 CEST | Update | N/A |
| article html file updated | 1 April 2017 13:34 CEST | Original file | N/A |
| article xml uploaded. | 1 April 2017 13:33 CEST | Original file | https://www.mdpi.com/2224-2708/6/2/4/xml |
| article pdf uploaded. | 1 April 2017 13:33 CEST | Version of Record | https://www.mdpi.com/2224-2708/6/2/4/pdf |
