| article html file updated | 7 February 2020 03:28 CET | Update | https://www.mdpi.com/2076-3417/6/1/21 |
| article html file updated | 6 May 2019 02:29 CEST | Update | - |
| article html file updated | 26 March 2019 18:33 CET | Original file | - |
| article pdf uploaded. | 15 January 2016 13:33 CET | Version of Record | https://www.mdpi.com/2076-3417/6/1/21/pdf |
| article xml uploaded. | 15 January 2016 13:33 CET | Original file | https://www.mdpi.com/2076-3417/6/1/21/xml |
