Anomalous variation in mitochondrial genomes of White-crowned (Zonotrichialeucophrys) and Golden-crowned (Z-atricapilla) sparrows: Pseudogenes, hybridization, or incomplete lineage sorting?
Jd. Weckstein et al., Anomalous variation in mitochondrial genomes of White-crowned (Zonotrichialeucophrys) and Golden-crowned (Z-atricapilla) sparrows: Pseudogenes, hybridization, or incomplete lineage sorting?, AUK, 118(1), 2001, pp. 231-236