| article html file updated | 7 February 2020 05:44 CET | Update | https://www.mdpi.com/1424-8247/9/1/12 |
| article html file updated | 5 May 2019 21:50 CEST | Update | - |
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| article pdf uploaded. | 10 March 2016 11:13 CET | Version of Record | https://www.mdpi.com/1424-8247/9/1/12/pdf |
| article xml uploaded. | 10 March 2016 11:13 CET | Original file | https://www.mdpi.com/1424-8247/9/1/12/xml |
