| article html file updated | 8 February 2020 01:17 CET | Update | https://www.mdpi.com/2076-0787/6/1/8 |
| article html file updated | 4 May 2019 07:06 CEST | Update | - |
| article html file updated | 13 March 2017 08:32 CET | Original file | - |
| article xml uploaded. | 13 March 2017 08:31 CET | Original file | https://www.mdpi.com/2076-0787/6/1/8/xml |
| article pdf uploaded. | 13 March 2017 08:31 CET | Updated version of record | https://www.mdpi.com/2076-0787/6/1/8/pdf |
| article pdf uploaded. | 11 March 2017 11:49 CET | Version of Record | https://www.mdpi.com/2076-0787/6/1/8/pdf-vor |
