| article html file updated | 7 February 2020 07:36 CET | Update | https://www.mdpi.com/2227-9040/4/2/7 |
| article html file updated | 5 May 2019 17:57 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:35 CET | Update | N/A |
| article html file updated | 1 July 2016 10:12 CEST | Update | N/A |
| article html file updated | 21 April 2016 12:06 CEST | Original file | N/A |
| article xml uploaded. | 21 April 2016 12:04 CEST | Original file | https://www.mdpi.com/2227-9040/4/2/7/xml |
| article pdf uploaded. | 21 April 2016 12:04 CEST | Version of Record | https://www.mdpi.com/2227-9040/4/2/7/pdf |
