| article html file updated | 8 February 2020 06:19 CET | Update | https://www.mdpi.com/2312-7481/3/2/19 |
| article html file updated | 24 September 2019 22:21 CEST | Update | - |
| article html file updated | 3 May 2019 21:08 CEST | Update | - |
| article html file updated | 30 June 2017 09:12 CEST | Original file | - |
| article pdf uploaded. | 20 May 2017 14:06 CEST | Version of Record | https://www.mdpi.com/2312-7481/3/2/19/pdf |
