| article html file updated | 8 February 2020 02:25 CET | Update | https://www.mdpi.com/1422-0067/18/4/721 |
| article html file updated | 24 September 2019 01:14 CEST | Update | - |
| article html file updated | 4 May 2019 04:39 CEST | Update | - |
| article html file updated | 2 May 2017 05:51 CEST | Update | - |
| article html file updated | 30 March 2017 05:29 CEST | Original file | - |
| article xml uploaded. | 30 March 2017 05:28 CEST | Original file | https://www.mdpi.com/1422-0067/18/4/721/xml |
| article pdf uploaded. | 30 March 2017 05:28 CEST | Updated version of record | https://www.mdpi.com/1422-0067/18/4/721/pdf |
| article pdf uploaded. | 28 March 2017 14:44 CEST | Version of Record | https://www.mdpi.com/1422-0067/18/4/721/pdf-vor |
