| article html file updated | 7 February 2020 01:27 CET | Update | https://www.mdpi.com/2079-9268/5/4/257 |
| article html file updated | 6 May 2019 06:34 CEST | Update | N/A |
| article html file updated | 26 March 2019 15:11 CET | Original file | N/A |
| article pdf uploaded. | 30 November 2015 15:13 CET | Updated version of record | https://www.mdpi.com/2079-9268/5/4/257/pdf |
| article pdf uploaded. | 27 November 2015 14:54 CET | Version of Record | https://www.mdpi.com/2079-9268/5/4/257/pdf-vor |
| article xml uploaded. | 27 November 2015 14:54 CET | Original file | https://www.mdpi.com/2079-9268/5/4/257/xml |
