| article html file updated | 7 February 2020 22:12 CET | Update | https://www.mdpi.com/2218-6581/6/1/2 |
| article html file updated | 23 September 2019 01:27 CEST | Update | - |
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| article html file updated | 30 March 2017 08:56 CEST | Update | - |
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| article xml uploaded. | 25 January 2017 09:08 CET | Original file | https://www.mdpi.com/2218-6581/6/1/2/xml |
| article pdf uploaded. | 25 January 2017 09:08 CET | Version of Record | https://www.mdpi.com/2218-6581/6/1/2/pdf |
