| article html file updated | 7 February 2020 06:12 CET | Update | https://www.mdpi.com/2304-6775/4/1/7 |
| article html file updated | 5 May 2019 20:50 CEST | Update | - |
| article html file updated | 26 March 2019 23:58 CET | Update | - |
| article html file updated | 29 March 2016 11:10 CEST | Original file | - |
| article xml uploaded. | 22 March 2016 08:51 CET | Original file | https://www.mdpi.com/2304-6775/4/1/7/xml |
| article pdf uploaded. | 22 March 2016 08:51 CET | Version of Record | https://www.mdpi.com/2304-6775/4/1/7/pdf |
