Hafstad, I., B. G. Stokke, J. R. Vikan, J. Rutila, E. Røskaft, and A. Moksnes. “Within-Year Nest Reuse in Open-Nesting, Solitary Breeding Passerines”. Ornis Norvegica, vol. 28, Jan. 2005, pp. 58-61, doi:10.15845/on.v28i0.190.