| article html file updated | 7 February 2020 18:25 CET | Update | https://www.mdpi.com/2227-7102/6/4/38 |
| article html file updated | 22 September 2019 06:27 CEST | Update | N/A |
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| article html file updated | 23 November 2016 04:14 CET | Original file | N/A |
| article xml uploaded. | 23 November 2016 04:13 CET | Original file | https://www.mdpi.com/2227-7102/6/4/38/xml |
| article pdf uploaded. | 23 November 2016 04:13 CET | Version of Record | https://www.mdpi.com/2227-7102/6/4/38/pdf |
