| article html file updated | 9 February 2020 03:38 CET | Update | https://www.mdpi.com/2311-5521/3/1/7 |
| article html file updated | 2 May 2019 01:04 CEST | Update | N/A |
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| article html file updated | 19 January 2018 19:14 CET | Original file | N/A |
| article xml uploaded. | 19 January 2018 19:13 CET | Original file | https://www.mdpi.com/2311-5521/3/1/7/xml |
| article pdf uploaded. | 19 January 2018 19:13 CET | Version of Record | https://www.mdpi.com/2311-5521/3/1/7/pdf |
