| article html file updated | 6 February 2020 02:48 CET | Update | https://www.mdpi.com/2223-7747/2/3/371 |
| article html file updated | 8 May 2019 03:41 CEST | Update | - |
| article html file updated | 21 March 2019 00:15 CET | Update | - |
| article html file updated | 17 June 2015 10:30 CEST | Original file | - |
| article pdf uploaded. | 25 June 2013 09:57 CEST | Version of Record | https://www.mdpi.com/2223-7747/2/3/371/pdf |
