| article html file updated | 7 February 2020 07:59 CET | Update | https://www.mdpi.com/2227-9067/3/2/7 |
| article html file updated | 21 September 2019 16:13 CEST | Update | N/A |
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| article html file updated | 1 July 2016 10:01 CEST | Update | N/A |
| article html file updated | 29 April 2016 10:07 CEST | Original file | N/A |
| article xml uploaded. | 29 April 2016 09:59 CEST | Original file | https://www.mdpi.com/2227-9067/3/2/7/xml |
| article pdf uploaded. | 29 April 2016 09:59 CEST | Version of Record | https://www.mdpi.com/2227-9067/3/2/7/pdf |
