| article html file updated | 7 February 2020 04:37 CET | Update | https://www.mdpi.com/1996-1073/9/2/108 |
| article html file updated | 6 May 2019 00:11 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:52 CET | Original file | N/A |
| article pdf uploaded. | 17 February 2016 04:09 CET | Version of Record | https://www.mdpi.com/1996-1073/9/2/108/pdf |
| article xml uploaded. | 17 February 2016 04:09 CET | Original file | https://www.mdpi.com/1996-1073/9/2/108/xml |
