| article html file updated | 6 December 2016 08:41 CET | Original file | https://www.mdpi.com/2409-515X/2/4/15 |
| article xml uploaded. | 6 December 2016 08:40 CET | Original file | https://www.mdpi.com/2409-515X/2/4/15/xml |
| article pdf uploaded. | 6 December 2016 08:40 CET | Version of Record | https://www.mdpi.com/2409-515X/2/4/15/pdf |
