| article html file updated | 7 February 2020 07:48 CET | Update | https://www.mdpi.com/2076-3263/6/2/21 |
| article html file updated | 5 May 2019 17:33 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:59 CET | Original file | N/A |
| article xml uploaded. | 26 April 2016 10:29 CEST | Update | https://www.mdpi.com/2076-3263/6/2/21/xml |
| article pdf uploaded. | 26 April 2016 10:28 CEST | Version of Record | https://www.mdpi.com/2076-3263/6/2/21/pdf |
