| article html file updated | 6 February 2020 05:21 CET | Update | https://www.mdpi.com/2075-4698/3/4/427 |
| article html file updated | 7 May 2019 22:29 CEST | Update | N/A |
| article html file updated | 21 March 2019 07:09 CET | Update | N/A |
| article html file updated | 19 December 2013 09:56 CET | Original file | N/A |
| article xml uploaded. | 19 December 2013 09:56 CET | Original file | https://www.mdpi.com/2075-4698/3/4/427/xml |
| article pdf uploaded. | 19 December 2013 09:55 CET | Updated version of record | https://www.mdpi.com/2075-4698/3/4/427/pdf |
| article pdf uploaded. | 5 November 2013 11:11 CET | Version of Record | https://www.mdpi.com/2075-4698/3/4/427/pdf-vor |
