| article html file updated | 8 February 2020 02:15 CET | Update | https://www.mdpi.com/1999-4907/8/4/97 |
| article html file updated | 4 May 2019 05:03 CEST | Update | N/A |
| article html file updated | 28 April 2017 06:39 CEST | Update | N/A |
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| article html file updated | 25 March 2017 22:33 CET | Update | N/A |
| article html file updated | 25 March 2017 09:36 CET | Original file | N/A |
| article xml uploaded. | 25 March 2017 09:34 CET | Original file | https://www.mdpi.com/1999-4907/8/4/97/xml |
| article pdf uploaded. | 25 March 2017 09:34 CET | Version of Record | https://www.mdpi.com/1999-4907/8/4/97/pdf |