| article html file updated | 7 February 2020 06:06 CET | Update | https://www.mdpi.com/2227-7102/6/1/12 |
| article html file updated | 5 May 2019 21:01 CEST | Update | - |
| article html file updated | 26 March 2019 23:50 CET | Update | - |
| article html file updated | 27 October 2017 09:48 CEST | Original file | - |
| article xml uploaded. | 18 March 2016 14:11 CET | Original file | https://www.mdpi.com/2227-7102/6/1/12/xml |
| article pdf uploaded. | 18 March 2016 14:11 CET | Version of Record | https://www.mdpi.com/2227-7102/6/1/12/pdf |
