| article html file updated | 7 February 2020 21:40 CET | Update | https://www.mdpi.com/2079-9276/6/1/4 |
| article html file updated | 22 September 2019 22:28 CEST | Update | - |
| article html file updated | 4 May 2019 14:46 CEST | Update | - |
| article html file updated | 30 March 2017 08:56 CEST | Update | - |
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| article xml uploaded. | 18 January 2017 08:55 CET | Original file | https://www.mdpi.com/2079-9276/6/1/4/xml |
| article pdf uploaded. | 18 January 2017 08:55 CET | Version of Record | https://www.mdpi.com/2079-9276/6/1/4/pdf |
