| article html file updated | 6 February 2020 00:32 CET | Update | https://www.mdpi.com/1999-4915/5/2/708 |
| article html file updated | 8 May 2019 08:28 CEST | Update | N/A |
| article html file updated | 20 March 2019 18:37 CET | Original file | N/A |
| article pdf uploaded. | 12 February 2013 12:06 CET | Version of Record | https://www.mdpi.com/1999-4915/5/2/708/pdf |
