Campos, A.R., Catry, P., Ramos, J. and Robalo, J. 2011. Competition among European Robins Erithacus rubecula in the winter quarters: sex is the best predictor of priority of access to experimental food resources. Ornis Fennica. 88, 4 (Dec. 2011), 226–233. DOI:https://doi.org/10.51812/of.133786.