| article html file updated | 8 February 2020 08:48 CET | Update | https://www.mdpi.com/2227-9067/4/6/51 |
| article html file updated | 25 September 2019 11:08 CEST | Update | - |
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| article html file updated | 27 June 2017 10:01 CEST | Update | - |
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| article xml uploaded. | 20 June 2017 16:06 CEST | Original file | https://www.mdpi.com/2227-9067/4/6/51/xml |
| article pdf uploaded. | 20 June 2017 16:06 CEST | Version of Record | https://www.mdpi.com/2227-9067/4/6/51/pdf |
