| article html file updated | 7 February 2020 03:34 CET | Update | https://www.mdpi.com/1996-1073/9/1/52 |
| article html file updated | 6 May 2019 02:20 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:44 CET | Original file | N/A |
| article pdf uploaded. | 19 January 2016 08:18 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/52/pdf |
| article xml uploaded. | 19 January 2016 08:18 CET | Original file | https://www.mdpi.com/1996-1073/9/1/52/xml |
