| article html file updated | 8 February 2020 05:04 CET | Update | https://www.mdpi.com/2218-1997/3/2/39 |
| article html file updated | 24 September 2019 15:48 CEST | Update | N/A |
| article html file updated | 3 May 2019 23:29 CEST | Update | N/A |
| article html file updated | 30 June 2017 09:16 CEST | Update | N/A |
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| article html file updated | 4 May 2017 13:52 CEST | Original file | N/A |
| article xml uploaded. | 4 May 2017 13:51 CEST | Original file | https://www.mdpi.com/2218-1997/3/2/39/xml |
| article pdf uploaded. | 4 May 2017 13:51 CEST | Version of Record | https://www.mdpi.com/2218-1997/3/2/39/pdf |
