1. Westoll, T. S. Ancestry of the tetrapods. Nature 141, 127 (1938)
2. Schultze, H.-P. & Arsenault, M. The panderichthyid fish Elpistostege: A close relative of tetrapods? Palaeontology 28, 292–309 (1985)
3. Schultze, H.-P. in Devonian Fishes and Plants of Miguasha, Quebec, Canada (eds Schultze, H.-P. & Cloutier, R.) 316–327 (Friedrich Pfeil, Munchen, 1996)
4. Vorobyeva, E. I. Observations on two rhipidistian fishes from the Upper Devonian of Lode, Latvia. Zool. J. Linn. Soc. 70, 191–201 (1980)
5. Vorobyeva, E. I. & Schultze, H.-P. Description and systematics of panderichthyid fishes with comments on their relationship to tetrapods. In Origins of the Higher Groups of Tetrapods (eds Schultze, H.-P. & Trueb, L.) 68–109 (Cornell Univ. Press, Ithaca, 1991)