| article html file updated | 7 February 2020 10:19 CET | Update | https://www.mdpi.com/2227-9709/3/2/7 |
| article html file updated | 5 May 2019 12:39 CEST | Update | N/A |
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| article html file updated | 17 June 2016 12:14 CEST | Original file | N/A |
| article xml uploaded. | 17 June 2016 12:13 CEST | Update | https://www.mdpi.com/2227-9709/3/2/7/xml |
| article pdf uploaded. | 17 June 2016 12:13 CEST | Version of Record | https://www.mdpi.com/2227-9709/3/2/7/pdf |
