| article html file updated | 7 February 2020 18:47 CET | Update | https://www.mdpi.com/2076-3263/6/4/52 |
| article html file updated | 4 May 2019 20:59 CEST | Update | - |
| article html file updated | 22 December 2016 09:21 CET | Original file | - |
| article xml uploaded. | 22 December 2016 09:20 CET | Update | https://www.mdpi.com/2076-3263/6/4/52/xml |
| article xml uploaded. | 22 December 2016 09:20 CET | Original file | - |
| article pdf uploaded. | 29 November 2016 12:31 CET | Version of Record | https://www.mdpi.com/2076-3263/6/4/52/pdf |
