| article html file updated | 6 February 2020 03:07 CET | Update | https://www.mdpi.com/2223-7747/2/3/473 |
| article html file updated | 19 September 2019 22:38 CEST | Update | - |
| article html file updated | 8 May 2019 03:03 CEST | Update | - |
| article html file updated | 21 March 2019 01:02 CET | Update | - |
| article html file updated | 17 June 2015 11:08 CEST | Original file | - |
| article pdf uploaded. | 10 July 2013 13:30 CEST | Version of Record | https://www.mdpi.com/2223-7747/2/3/473/pdf |
