| article html file updated | 7 February 2020 09:59 CET | Update | https://www.mdpi.com/2227-9709/3/2/6 |
| article html file updated | 5 May 2019 13:19 CEST | Update | N/A |
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| article html file updated | 30 October 2017 08:33 CET | Update | N/A |
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| article html file updated | 9 June 2016 09:36 CEST | Original file | N/A |
| article xml uploaded. | 9 June 2016 09:34 CEST | Original file | https://www.mdpi.com/2227-9709/3/2/6/xml |
| article pdf uploaded. | 9 June 2016 09:34 CEST | Version of Record | https://www.mdpi.com/2227-9709/3/2/6/pdf |
