| article html file updated | 8 February 2020 21:17 CET | Update | https://www.mdpi.com/2227-7382/5/4/31 |
| article html file updated | 28 September 2019 12:04 CEST | Update | N/A |
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| article html file updated | 15 November 2017 12:22 CET | Original file | N/A |
| article xml uploaded. | 15 November 2017 12:21 CET | Original file | https://www.mdpi.com/2227-7382/5/4/31/xml |
| article pdf uploaded. | 15 November 2017 12:21 CET | Version of Record | https://www.mdpi.com/2227-7382/5/4/31/pdf |
