| article html file updated | 8 February 2020 03:34 CET | Update | https://www.mdpi.com/2076-0787/6/2/23 |
| article html file updated | 4 May 2019 02:16 CEST | Update | N/A |
| article html file updated | 18 April 2017 11:09 CEST | Original file | N/A |
| article xml uploaded. | 18 April 2017 11:08 CEST | Original file | https://www.mdpi.com/2076-0787/6/2/23/xml |
| article pdf uploaded. | 18 April 2017 11:08 CEST | Updated version of record | https://www.mdpi.com/2076-0787/6/2/23/pdf |
| article pdf uploaded. | 13 April 2017 14:30 CEST | Version of Record | https://www.mdpi.com/2076-0787/6/2/23/pdf-vor |
