| article html file updated | 7 February 2020 06:43 CET | Update | https://www.mdpi.com/2227-9717/4/2/8 |
| article html file updated | 5 May 2019 19:48 CEST | Update | - |
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| article html file updated | 4 July 2016 09:51 CEST | Update | - |
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| article xml uploaded. | 1 April 2016 15:24 CEST | Original file | https://www.mdpi.com/2227-9717/4/2/8/xml |
| article pdf uploaded. | 1 April 2016 15:24 CEST | Version of Record | https://www.mdpi.com/2227-9717/4/2/8/pdf |
