| article html file updated | 8 February 2020 02:43 CET | Update | https://www.mdpi.com/1422-0067/18/4/691 |
| article html file updated | 24 September 2019 02:57 CEST | Update | - |
| article html file updated | 4 May 2019 03:59 CEST | Update | - |
| article html file updated | 2 May 2017 05:46 CEST | Update | - |
| article html file updated | 1 April 2017 05:00 CEST | Original file | - |
| article xml uploaded. | 1 April 2017 04:59 CEST | Original file | https://www.mdpi.com/1422-0067/18/4/691/xml |
| article pdf uploaded. | 1 April 2017 04:59 CEST | Version of Record | https://www.mdpi.com/1422-0067/18/4/691/pdf |
