| article html file updated | 7 February 2020 03:47 CET | Update | https://www.mdpi.com/2227-7072/4/1/2 |
| article html file updated | 6 May 2019 01:54 CEST | Update | - |
| article html file updated | 26 March 2019 19:09 CET | Update | - |
| article html file updated | 29 March 2016 07:19 CEST | Original file | - |
| article pdf uploaded. | 22 January 2016 13:43 CET | Version of Record | https://www.mdpi.com/2227-7072/4/1/2/pdf |
| article xml uploaded. | 22 January 2016 13:43 CET | Original file | https://www.mdpi.com/2227-7072/4/1/2/xml |
