| article html file updated | 9 February 2020 12:50 CET | Update | https://www.mdpi.com/2304-8158/7/4/57 |
| article html file updated | 2 October 2019 08:47 CEST | Update | - |
| article html file updated | 1 May 2019 05:26 CEST | Update | - |
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| article html file updated | 1 May 2018 05:26 CEST | Update | - |
| article html file updated | 7 April 2018 06:01 CEST | Original file | - |
| article xml uploaded. | 7 April 2018 06:00 CEST | Original file | https://www.mdpi.com/2304-8158/7/4/57/xml |
| article pdf uploaded. | 7 April 2018 06:00 CEST | Version of Record | https://www.mdpi.com/2304-8158/7/4/57/pdf |
