| article html file updated | 7 February 2020 01:34 CET | Update | https://www.mdpi.com/2075-4442/3/4/664 |
| article html file updated | 6 May 2019 06:20 CEST | Update | - |
| article html file updated | 26 March 2019 15:23 CET | Original file | - |
| article pdf uploaded. | 1 December 2015 14:17 CET | Version of Record | https://www.mdpi.com/2075-4442/3/4/664/pdf |
| article xml uploaded. | 1 December 2015 14:17 CET | Original file | https://www.mdpi.com/2075-4442/3/4/664/xml |
