| article html file updated | 8 February 2020 07:03 CET | Update | https://www.mdpi.com/2227-9067/4/6/43 |
| article html file updated | 25 September 2019 02:07 CEST | Update | N/A |
| article html file updated | 3 May 2019 19:47 CEST | Update | N/A |
| article html file updated | 27 June 2017 10:01 CEST | Update | N/A |
| article html file updated | 1 June 2017 13:05 CEST | Original file | N/A |
| article xml uploaded. | 1 June 2017 13:04 CEST | Original file | https://www.mdpi.com/2227-9067/4/6/43/xml |
| article pdf uploaded. | 1 June 2017 13:04 CEST | Updated version of record | https://www.mdpi.com/2227-9067/4/6/43/pdf |
| article pdf uploaded. | 30 May 2017 15:04 CEST | Version of Record | https://www.mdpi.com/2227-9067/4/6/43/pdf-vor |
