| article html file updated | 8 February 2020 07:31 CET | Update | https://www.mdpi.com/2079-6374/7/2/21 |
| article html file updated | 25 September 2019 04:29 CEST | Update | N/A |
| article html file updated | 3 May 2019 18:53 CEST | Update | N/A |
| article html file updated | 28 June 2017 12:43 CEST | Update | N/A |
| article html file updated | 5 June 2017 14:08 CEST | Original file | N/A |
| article xml uploaded. | 5 June 2017 14:07 CEST | Update | https://www.mdpi.com/2079-6374/7/2/21/xml |
| article pdf uploaded. | 5 June 2017 14:07 CEST | Version of Record | https://www.mdpi.com/2079-6374/7/2/21/pdf |
