Reference
Charles F. Nadler, Robert S. Hoffmann, K. V. Korobitsina, N.N. Vorontsov (1972): Cytogenetic Differentiation, Geographie Distribution, and
Domestication in Palearctic Sheep (Ovis) – Mammalian Biology (früher Zeitschrift für Säugetierkunde) – 38: 109 - 125.