| article html file updated | 7 February 2020 03:13 CET | Update | https://www.mdpi.com/2227-9032/4/1/6 |
| article html file updated | 6 May 2019 02:58 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:02 CET | Update | N/A |
| article html file updated | 18 May 2016 12:20 CEST | Original file | N/A |
| article pdf uploaded. | 8 January 2016 15:13 CET | Version of Record | https://www.mdpi.com/2227-9032/4/1/6/pdf |
| article xml uploaded. | 8 January 2016 15:13 CET | Original file | https://www.mdpi.com/2227-9032/4/1/6/xml |
