| article html file updated | 7 February 2020 23:53 CET | Update | https://www.mdpi.com/2076-0760/6/1/21 |
| article html file updated | 4 May 2019 10:16 CEST | Update | N/A |
| article html file updated | 24 February 2017 07:10 CET | Original file | N/A |
| article xml uploaded. | 21 February 2017 11:56 CET | Original file | https://www.mdpi.com/2076-0760/6/1/21/xml |
| article pdf uploaded. | 21 February 2017 11:56 CET | Version of Record | https://www.mdpi.com/2076-0760/6/1/21/pdf |
