| article html file updated | 9 February 2020 10:40 CET | Update | https://www.mdpi.com/2227-9040/6/2/12 |
| article html file updated | 1 October 2019 20:05 CEST | Update | N/A |
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| article xml uploaded. | 21 March 2018 15:31 CET | Original file | https://www.mdpi.com/2227-9040/6/2/12/xml |
| article pdf uploaded. | 21 March 2018 15:31 CET | Version of Record | https://www.mdpi.com/2227-9040/6/2/12/pdf |