| article html file updated | 6 February 2020 13:10 CET | Update | https://www.mdpi.com/1911-8074/7/4/130 |
| article html file updated | 7 May 2019 06:28 CEST | Update | - |
| article html file updated | 25 March 2019 16:37 CET | Original file | - |
| article pdf uploaded. | 18 January 2019 03:49 CET | Updated version of record | https://www.mdpi.com/1911-8074/7/4/130/pdf |
| article pdf uploaded. | 27 October 2014 13:34 CET | Version of Record | https://www.mdpi.com/1911-8074/7/4/130/pdf-vor |
