| article html file updated | 7 February 2020 21:33 CET | Update | https://www.mdpi.com/2304-6740/5/1/6 |
| article html file updated | 4 May 2019 15:06 CEST | Update | - |
| article html file updated | 30 March 2017 03:27 CEST | Update | - |
| article html file updated | 16 January 2017 11:41 CET | Original file | - |
| article xml uploaded. | 16 January 2017 11:39 CET | Original file | https://www.mdpi.com/2304-6740/5/1/6/xml |
| article pdf uploaded. | 16 January 2017 11:39 CET | Version of Record | https://www.mdpi.com/2304-6740/5/1/6/pdf |
