| article html file updated | 8 February 2020 07:14 CET | Update | https://www.mdpi.com/2227-9067/4/6/44 |
| article html file updated | 25 September 2019 03:02 CEST | Update | - |
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| article html file updated | 27 June 2017 10:01 CEST | Update | - |
| article html file updated | 1 June 2017 13:53 CEST | Original file | - |
| article xml uploaded. | 1 June 2017 13:52 CEST | Original file | https://www.mdpi.com/2227-9067/4/6/44/xml |
| article pdf uploaded. | 1 June 2017 13:52 CEST | Version of Record | https://www.mdpi.com/2227-9067/4/6/44/pdf |
