| article pdf uploaded. | 8 September 2017 07:37 CEST | Updated version of record | https://www.mdpi.com/2218-0532/69/2/109/pdf |
| article pdf uploaded. | 8 September 2017 06:30 CEST | Updated version of record | N/A |
| article pdf uploaded. | 17 August 2017 12:35 CEST | Version of Record | N/A |
