Griffiths, B., Römbke, J., Schmelz, R., Scheffczyk, A., Faber, J., Bloem, J., Pérès, G., Cluzeau, D., Chabbi, A., Suhadolc, M., Sousa, J., Martins da Silva, P., Carvalho, F., Mendes, S., Morais, P., Francisco, R., Pereira, C., Bonkowski, M., Geisen, S., Bardgett, R., de Vries, F., Bolger, T., Dirilgen, T., Schmidt, O., Winding, A., Hendriksen, N., Johansen, A., Philippot, L., Plassart, P., Bru, D., Thomson, B., Griffiths, R., Bailey, M., Keith, A., Rutgers, M., Mulder, C., Hannula, S., Creamer, R., & Stone, D. (2016). selecting cost effective and policy-relevant biological indicators for European monitoring of soil biodiversity and ecosystem function. Ecological indicators, 69, 213–223. http://access.bl.uk/ark:/81055/vdc_100034056540.0x00001e