| article html file updated | 7 February 2020 17:15 CET | Update | https://www.mdpi.com/2073-4395/6/4/54 |
| article html file updated | 22 September 2019 04:18 CEST | Update | - |
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| article html file updated | 29 December 2016 04:32 CET | Update | - |
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| article xml uploaded. | 31 October 2016 09:16 CET | Original file | https://www.mdpi.com/2073-4395/6/4/54/xml |
| article pdf uploaded. | 31 October 2016 09:16 CET | Version of Record | https://www.mdpi.com/2073-4395/6/4/54/pdf |
