| article html file updated | 7 February 2020 03:45 CET | Update | https://www.mdpi.com/1996-1073/9/1/64 |
| article html file updated | 6 May 2019 01:58 CEST | Update | - |
| article html file updated | 26 March 2019 19:05 CET | Original file | - |
| article pdf uploaded. | 21 January 2016 16:21 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/64/pdf |
| article xml uploaded. | 21 January 2016 16:21 CET | Original file | https://www.mdpi.com/1996-1073/9/1/64/xml |
