| article html file updated | 7 February 2020 02:32 CET | Update | https://www.mdpi.com/1660-4601/13/1/21 |
| article html file updated | 21 September 2019 08:21 CEST | Update | N/A |
| article html file updated | 6 May 2019 04:22 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:57 CET | Original file | N/A |
| article xml uploaded. | 22 December 2015 16:44 CET | Update | https://www.mdpi.com/1660-4601/13/1/21/xml |
| article xml uploaded. | 22 December 2015 16:44 CET | Original file | N/A |
| article pdf uploaded. | 22 December 2015 16:42 CET | Version of Record | https://www.mdpi.com/1660-4601/13/1/21/pdf |
