| article html file updated | 30 August 2025 02:40 CEST | Update | https://www.mdpi.com/2227-9032/6/1/18 |
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| article xml uploaded. | 24 February 2018 09:16 CET | Original file | https://www.mdpi.com/2227-9032/6/1/18/xml |
| article pdf uploaded. | 24 February 2018 09:16 CET | Updated version of record | https://www.mdpi.com/2227-9032/6/1/18/pdf |
| article pdf uploaded. | 20 February 2018 16:32 CET | Version of Record | https://www.mdpi.com/2227-9032/6/1/18/pdf-vor |
