| article html file updated | 7 February 2020 02:31 CET | Update | https://www.mdpi.com/1660-4601/13/1/20 |
| article html file updated | 6 May 2019 04:24 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:56 CET | Original file | N/A |
| article pdf uploaded. | 23 December 2015 10:06 CET | Version of Record | https://www.mdpi.com/1660-4601/13/1/20/pdf |
| article xml uploaded. | 23 December 2015 10:06 CET | Original file | https://www.mdpi.com/1660-4601/13/1/20/xml |
