| article html file updated | 6 February 2020 08:48 CET | Update | https://www.mdpi.com/2304-8158/3/2/269 |
| article html file updated | 20 September 2019 07:43 CEST | Update | - |
| article html file updated | 7 May 2019 15:29 CEST | Update | - |
| article html file updated | 21 March 2019 16:00 CET | Update | - |
| article html file updated | 16 February 2017 03:39 CET | Update | - |
| article html file updated | 11 February 2017 05:47 CET | Update | - |
| article html file updated | 20 August 2015 04:17 CEST | Original file | - |
| article pdf uploaded. | 23 April 2014 09:53 CEST | Version of Record | https://www.mdpi.com/2304-8158/3/2/269/pdf |
