| article html file updated | 8 February 2020 14:58 CET | Update | https://www.mdpi.com/2076-0787/6/3/68 |
| article html file updated | 3 May 2019 04:13 CEST | Update | N/A |
| article html file updated | 31 August 2017 14:25 CEST | Original file | N/A |
| article xml uploaded. | 31 August 2017 14:23 CEST | Original file | https://www.mdpi.com/2076-0787/6/3/68/xml |
| article pdf uploaded. | 31 August 2017 14:23 CEST | Version of Record | https://www.mdpi.com/2076-0787/6/3/68/pdf |
