| article html file updated | 8 February 2020 03:13 CET | Update | https://www.mdpi.com/2304-8158/6/4/30 |
| article html file updated | 24 September 2019 05:46 CEST | Update | - |
| article html file updated | 4 May 2019 02:54 CEST | Update | - |
| article html file updated | 28 April 2017 07:57 CEST | Update | - |
| article html file updated | 10 April 2017 08:24 CEST | Original file | - |
| article xml uploaded. | 10 April 2017 08:23 CEST | Original file | https://www.mdpi.com/2304-8158/6/4/30/xml |
| article pdf uploaded. | 10 April 2017 08:23 CEST | Version of Record | https://www.mdpi.com/2304-8158/6/4/30/pdf |
