| article html file updated | 7 February 2020 04:22 CET | Update | https://www.mdpi.com/2312-7481/2/1/6 |
| article html file updated | 6 May 2019 00:47 CEST | Update | - |
| article html file updated | 26 March 2019 20:18 CET | Update | - |
| article html file updated | 8 June 2016 09:23 CEST | Original file | - |
| article pdf uploaded. | 5 February 2016 12:30 CET | Version of Record | https://www.mdpi.com/2312-7481/2/1/6/pdf |
| article xml uploaded. | 5 February 2016 12:30 CET | Original file | https://www.mdpi.com/2312-7481/2/1/6/xml |
