https://123dok.net/document/zx5j87vq-efi-plus-project-improvement-and-spatial-extension-of-the-european-fish-index-deliverable-4-1-report-on-the-modelling-of-reference-conditions-and-on-the-sensitivity-of-candidate-metrics-to-anthropogenic-pressures-deliverable-4-2-report-on-the-final-develo.html