| article html file updated | 8 February 2020 03:29 CET | Update | https://www.mdpi.com/2220-9964/6/4/117 |
| article html file updated | 24 September 2019 07:08 CEST | Update | - |
| article html file updated | 4 May 2019 02:24 CEST | Update | - |
| article html file updated | 28 April 2017 08:17 CEST | Update | - |
| article html file updated | 13 April 2017 11:36 CEST | Original file | - |
| article xml uploaded. | 13 April 2017 11:34 CEST | Original file | https://www.mdpi.com/2220-9964/6/4/117/xml |
| article pdf uploaded. | 13 April 2017 11:34 CEST | Version of Record | https://www.mdpi.com/2220-9964/6/4/117/pdf |
