| article html file updated | 7 February 2020 04:11 CET | Update | https://www.mdpi.com/1996-1073/9/2/90 |
| article html file updated | 6 May 2019 01:09 CEST | Update | - |
| article html file updated | 26 March 2019 19:55 CET | Original file | - |
| article pdf uploaded. | 2 February 2016 11:11 CET | Version of Record | https://www.mdpi.com/1996-1073/9/2/90/pdf |
| article xml uploaded. | 2 February 2016 11:11 CET | Original file | https://www.mdpi.com/1996-1073/9/2/90/xml |
