| article html file updated | 7 February 2020 03:50 CET | Update | https://www.mdpi.com/2312-7481/2/1/4 |
| article html file updated | 6 May 2019 01:48 CEST | Update | - |
| article html file updated | 26 March 2019 19:16 CET | Update | - |
| article html file updated | 8 June 2016 09:22 CEST | Original file | - |
| article pdf uploaded. | 25 January 2016 11:35 CET | Version of Record | https://www.mdpi.com/2312-7481/2/1/4/pdf |
| article xml uploaded. | 25 January 2016 11:35 CET | Original file | https://www.mdpi.com/2312-7481/2/1/4/xml |
