| article html file updated | 7 February 2020 06:13 CET | Update | https://www.mdpi.com/2304-6775/4/1/6 |
| article html file updated | 21 September 2019 13:40 CEST | Update | - |
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| article xml uploaded. | 22 March 2016 09:01 CET | Original file | https://www.mdpi.com/2304-6775/4/1/6/xml |
| article pdf uploaded. | 22 March 2016 09:01 CET | Version of Record | https://www.mdpi.com/2304-6775/4/1/6/pdf |
