| article html file updated | 9 February 2020 10:31 CET | Update | https://www.mdpi.com/2227-7080/6/1/36 |
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| article xml uploaded. | 20 March 2018 15:46 CET | Update | https://www.mdpi.com/2227-7080/6/1/36/xml |
| article pdf uploaded. | 20 March 2018 15:46 CET | Version of Record | https://www.mdpi.com/2227-7080/6/1/36/pdf |