| article html file updated | 7 February 2020 04:11 CET | Update | https://www.mdpi.com/2220-9964/5/2/9 |
| article html file updated | 6 May 2019 01:10 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:55 CET | Original file | N/A |
| article pdf uploaded. | 2 February 2016 09:46 CET | Version of Record | https://www.mdpi.com/2220-9964/5/2/9/pdf |
| article xml uploaded. | 2 February 2016 09:46 CET | Original file | https://www.mdpi.com/2220-9964/5/2/9/xml |
