| article html file updated | 7 February 2020 06:36 CET | Update | https://www.mdpi.com/2227-9717/4/2/9 |
| article html file updated | 5 May 2019 20:02 CEST | Update | N/A |
| article html file updated | 27 March 2019 00:39 CET | Update | N/A |
| article html file updated | 4 July 2016 09:52 CEST | Update | N/A |
| article html file updated | 30 March 2016 09:00 CEST | Original file | N/A |
| article xml uploaded. | 30 March 2016 08:59 CEST | Original file | https://www.mdpi.com/2227-9717/4/2/9/xml |
| article pdf uploaded. | 30 March 2016 08:59 CEST | Version of Record | https://www.mdpi.com/2227-9717/4/2/9/pdf |
