| article html file updated | 8 February 2020 02:57 CET | Update | https://www.mdpi.com/2220-9964/6/4/108 |
| article html file updated | 24 September 2019 04:18 CEST | Update | - |
| article html file updated | 4 May 2019 03:28 CEST | Update | - |
| article html file updated | 28 April 2017 08:15 CEST | Update | - |
| article html file updated | 5 April 2017 13:31 CEST | Original file | - |
| article xml uploaded. | 5 April 2017 13:29 CEST | Original file | https://www.mdpi.com/2220-9964/6/4/108/xml |
| article pdf uploaded. | 5 April 2017 13:29 CEST | Version of Record | https://www.mdpi.com/2220-9964/6/4/108/pdf |
