| article html file updated | 7 February 2020 06:58 CET | Update | https://www.mdpi.com/1422-0067/17/4/521 |
| article html file updated | 5 May 2019 19:17 CEST | Update | - |
| article html file updated | 27 March 2019 01:18 CET | Update | - |
| article html file updated | 28 April 2016 05:04 CEST | Update | - |
| article html file updated | 7 April 2016 13:25 CEST | Original file | - |
| article xml uploaded. | 7 April 2016 13:24 CEST | Original file | https://www.mdpi.com/1422-0067/17/4/521/xml |
| article pdf uploaded. | 7 April 2016 13:24 CEST | Version of Record | https://www.mdpi.com/1422-0067/17/4/521/pdf |
