| article html file updated | 6 February 2020 08:10 CET | Update | https://www.mdpi.com/2223-7747/3/2/196 |
| article html file updated | 7 May 2019 16:49 CEST | Update | N/A |
| article html file updated | 21 March 2019 14:29 CET | Update | N/A |
| article html file updated | 20 August 2015 01:03 CEST | Original file | N/A |
| article pdf uploaded. | 25 March 2014 14:16 CET | Version of Record | https://www.mdpi.com/2223-7747/3/2/196/pdf |
