| article html file updated | 7 February 2020 03:43 CET | Update | https://www.mdpi.com/1999-4923/8/1/3 |
| article html file updated | 6 May 2019 02:02 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:01 CET | Update | N/A |
| article html file updated | 29 March 2016 11:10 CEST | Original file | N/A |
| article xml uploaded. | 21 January 2016 12:12 CET | Original file | https://www.mdpi.com/1999-4923/8/1/3/xml |
| article pdf uploaded. | 21 January 2016 12:12 CET | Version of Record | https://www.mdpi.com/1999-4923/8/1/3/pdf |
