| article html file updated | 6 February 2020 05:52 CET | Update | https://www.mdpi.com/2073-4441/5/4/1996 |
| article html file updated | 7 May 2019 21:30 CEST | Update | N/A |
| article html file updated | 21 March 2019 08:30 CET | Update | N/A |
| article html file updated | 19 August 2015 11:39 CEST | Original file | N/A |
| article pdf uploaded. | 5 December 2013 16:03 CET | Updated version of record | https://www.mdpi.com/2073-4441/5/4/1996/pdf |
| article pdf uploaded. | 28 November 2013 15:01 CET | Version of Record | https://www.mdpi.com/2073-4441/5/4/1996/pdf-vor |
