| article html file updated | 7 February 2020 03:43 CET | Update | https://www.mdpi.com/1996-1073/9/1/63 |
| article html file updated | 6 May 2019 02:01 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:01 CET | Original file | N/A |
| article pdf uploaded. | 21 January 2016 10:24 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/63/pdf |
| article xml uploaded. | 21 January 2016 10:24 CET | Original file | https://www.mdpi.com/1996-1073/9/1/63/xml |
