| article html file updated | 8 February 2020 05:33 CET | Update | https://www.mdpi.com/1424-2818/9/2/21 |
| article html file updated | 24 September 2019 18:20 CEST | Update | N/A |
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| article html file updated | 29 June 2017 11:22 CEST | Update | N/A |
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| article html file updated | 11 May 2017 04:10 CEST | Original file | N/A |
| article xml uploaded. | 11 May 2017 04:07 CEST | Update | https://www.mdpi.com/1424-2818/9/2/21/xml |
| article pdf uploaded. | 11 May 2017 04:02 CEST | Version of Record | https://www.mdpi.com/1424-2818/9/2/21/pdf |
