WILTING, A., PATEL, R. et al. (2016) – Zootier Lexikon https://www.zootier-lexikon.org/bibliographie/w-1699975706/wilting-a-patel-r-pfestorf-h-kern-c-sultan-k-ario-a-penaloza-f-kramer-schadt-s-radchuk-v-foerster-d-w-fickel-j-2016
Several scenarios have been proposed to explain this distribution gap.
