| article html file updated | 8 February 2020 07:42 CET | Update | https://www.mdpi.com/2227-7102/7/2/61 |
| article html file updated | 25 September 2019 05:24 CEST | Update | - |
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| article html file updated | 27 October 2017 09:58 CEST | Update | - |
| article html file updated | 7 June 2017 13:04 CEST | Original file | - |
| article xml uploaded. | 7 June 2017 13:02 CEST | Original file | https://www.mdpi.com/2227-7102/7/2/61/xml |
| article pdf uploaded. | 7 June 2017 13:02 CEST | Version of Record | https://www.mdpi.com/2227-7102/7/2/61/pdf |
