| article html file updated | 6 February 2020 14:26 CET | Update | https://www.mdpi.com/1999-4907/5/12/3169 |
| article html file updated | 7 May 2019 04:01 CEST | Update | N/A |
| article html file updated | 25 March 2019 19:12 CET | Update | N/A |
| article html file updated | 21 August 2015 04:05 CEST | Original file | N/A |
| article pdf uploaded. | 12 December 2014 12:18 CET | Version of Record | https://www.mdpi.com/1999-4907/5/12/3169/pdf |
