Wolf, Hans Georg Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;
https://link.springer.com/article/10.1007/BF00378763 (Publisher version)
Wolf, H. G., & Mort, M. A. (1986). Inter-specific hybridization underlies phenotypic variability in Daphnia populations. Oecologia, 68(4), 507-511.