| article html file updated | 7 February 2020 19:58 CET | Update | https://www.mdpi.com/2227-9709/3/4/23 |
| article html file updated | 22 September 2019 13:26 CEST | Update | - |
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| article xml uploaded. | 20 December 2016 12:48 CET | Original file | https://www.mdpi.com/2227-9709/3/4/23/xml |
| article pdf uploaded. | 20 December 2016 12:48 CET | Version of Record | https://www.mdpi.com/2227-9709/3/4/23/pdf |
