| article html file updated | 9 February 2020 09:11 CET | Update | https://www.mdpi.com/2218-1997/4/3/52 |
| article html file updated | 1 May 2019 13:09 CEST | Update | - |
| article html file updated | 17 April 2019 12:49 CEST | Update | - |
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| article html file updated | 26 March 2018 12:51 CEST | Update | - |
| article html file updated | 9 March 2018 02:43 CET | Original file | - |
| article xml uploaded. | 9 March 2018 02:42 CET | Original file | https://www.mdpi.com/2218-1997/4/3/52/xml |
| article pdf uploaded. | 9 March 2018 02:42 CET | Version of Record | https://www.mdpi.com/2218-1997/4/3/52/pdf |
