| article html file updated | 7 February 2020 23:11 CET | Update | https://www.mdpi.com/2073-4352/7/2/50 |
| article html file updated | 4 May 2019 11:40 CEST | Update | - |
| article html file updated | 2 March 2017 03:46 CET | Update | - |
| article html file updated | 13 February 2017 06:53 CET | Original file | - |
| article xml uploaded. | 13 February 2017 06:52 CET | Original file | https://www.mdpi.com/2073-4352/7/2/50/xml |
| article pdf uploaded. | 13 February 2017 06:52 CET | Updated version of record | https://www.mdpi.com/2073-4352/7/2/50/pdf |
| article pdf uploaded. | 11 February 2017 04:48 CET | Version of Record | https://www.mdpi.com/2073-4352/7/2/50/pdf-vor |
