Structure and genesis of the Cubango Megafan in northern Namibia: implications for its hydrogeology - F. Lindenmaier; R. Miller; J. Fenner; G. Christelis; H. G. Dill; T. Himmelsbach; S. Kaufhold; C. Lohe; M. Quinger; F. Schildknecht; G. Symons; A. Walzer; et al. (Hydrogeology Journal, 2014)