| article html file updated | 8 February 2020 23:31 CET | Update | https://www.mdpi.com/2227-9059/5/4/69 |
| article html file updated | 2 May 2019 09:49 CEST | Update | - |
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| article html file updated | 8 December 2017 15:21 CET | Original file | - |
| article xml uploaded. | 8 December 2017 15:19 CET | Original file | https://www.mdpi.com/2227-9059/5/4/69/xml |
| article pdf uploaded. | 8 December 2017 15:19 CET | Version of Record | https://www.mdpi.com/2227-9059/5/4/69/pdf |
