| article html file updated | 7 February 2020 06:00 CET | Update | https://www.mdpi.com/1424-8247/9/1/15 |
| article html file updated | 29 September 2019 08:05 CEST | Update | - |
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| article html file updated | 30 March 2016 12:10 CEST | Original file | - |
| article xml uploaded. | 17 March 2016 07:47 CET | Original file | https://www.mdpi.com/1424-8247/9/1/15/xml |
| article pdf uploaded. | 17 March 2016 07:47 CET | Version of Record | https://www.mdpi.com/1424-8247/9/1/15/pdf |
