| article pdf uploaded. | 8 September 2017 05:02 CEST | Updated version of record | https://www.mdpi.com/2218-0532/69/3/249/pdf |
| article pdf uploaded. | 25 August 2017 10:11 CEST | Updated version of record | https://www.mdpi.com/2218-0532/69/3/249/pdf-vor |
| article pdf uploaded. | 25 August 2017 09:58 CEST | Version of Record | https://www.mdpi.com/2218-0532/69/3/249/pdf-vor |
