BORGSTRÖM, E. Dwarf eggs in some hole-nesting species. Ornis Svecica, Lund, Sweden, v. 14, n. 4, p. 180–182, 2004. DOI: 10.34080/os.v14.22762. Disponível em: https://journals.lub.lu.se/os/article/view/22762. Acesso em: 23 may. 2022.