| article html file updated | 7 February 2020 03:50 CET | Update | https://www.mdpi.com/2227-7102/6/1/2 |
| article html file updated | 21 September 2019 10:17 CEST | Update | N/A |
| article html file updated | 6 May 2019 01:48 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:16 CET | Update | N/A |
| article html file updated | 27 October 2017 09:47 CEST | Original file | N/A |
| article pdf uploaded. | 25 January 2016 11:18 CET | Version of Record | https://www.mdpi.com/2227-7102/6/1/2/pdf |
| article xml uploaded. | 25 January 2016 11:18 CET | Original file | https://www.mdpi.com/2227-7102/6/1/2/xml |
