| article html file updated | 6 February 2020 10:31 CET | Update | https://www.mdpi.com/2079-9721/2/3/226 |
| article html file updated | 7 May 2019 12:00 CEST | Update | N/A |
| article html file updated | 21 March 2019 20:21 CET | Update | N/A |
| article html file updated | 20 August 2015 12:04 CEST | Original file | N/A |
| article pdf uploaded. | 9 July 2014 15:06 CEST | Updated version of record | https://www.mdpi.com/2079-9721/2/3/226/pdf |
| article pdf uploaded. | 7 July 2014 14:41 CEST | Version of Record | https://www.mdpi.com/2079-9721/2/3/226/pdf-vor |
