| article html file updated | 6 February 2020 03:11 CET | Update | https://www.mdpi.com/1996-1073/6/7/3405 |
| article html file updated | 8 May 2019 02:55 CEST | Update | N/A |
| article html file updated | 21 March 2019 01:12 CET | Original file | N/A |
| article pdf uploaded. | 12 July 2013 15:56 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/7/3405/pdf |
