| article html file updated | 6 February 2020 11:37 CET | Update | https://www.mdpi.com/2306-5354/1/3/134 |
| article html file updated | 21 March 2019 23:27 CET | Update | - |
| article html file updated | 13 February 2017 08:41 CET | Update | - |
| article html file updated | 20 August 2015 16:00 CEST | Original file | - |
| article pdf uploaded. | 20 August 2014 11:50 CEST | Version of Record | https://www.mdpi.com/2306-5354/1/3/134/pdf |
