| article html file updated | 5 February 2020 10:30 CET | Update | https://www.mdpi.com/1422-0067/3/4/435 |
| article html file updated | 9 May 2019 15:02 CEST | Update | N/A |
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| article html file updated | 20 July 2017 04:06 CEST | Update | N/A |
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| article xml uploaded. | 20 July 2017 04:03 CEST | Original file | https://www.mdpi.com/1422-0067/3/4/435/xml |
