| article html file updated | 7 February 2020 03:15 CET | Update | https://www.mdpi.com/1996-1073/9/1/37 |
| article html file updated | 6 May 2019 02:55 CEST | Update | - |
| article html file updated | 26 March 2019 18:05 CET | Original file | - |
| article pdf uploaded. | 11 January 2016 14:06 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/37/pdf |
| article xml uploaded. | 11 January 2016 14:06 CET | Original file | https://www.mdpi.com/1996-1073/9/1/37/xml |
