| article html file updated | 7 February 2020 04:35 CET | Update | https://www.mdpi.com/2072-6694/8/2/21 |
| article html file updated | 6 May 2019 00:17 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:47 CET | Original file | N/A |
| article pdf uploaded. | 16 February 2016 08:37 CET | Version of Record | https://www.mdpi.com/2072-6694/8/2/21/pdf |
| article xml uploaded. | 16 February 2016 08:37 CET | Original file | https://www.mdpi.com/2072-6694/8/2/21/xml |
