1. D.W.C. Baker, D.E. Elliott, D.G. Jones, D. Pearson, Proceedings of the Second International Conference on Rain Erosion, 1967, p. 449
2. W. Herbert, Proceedings of the Second International Conference on Rain Erosion, 1967, p. 359
3. H. Rieger, Proceedings of the Third International Conference on Rain Erosion, 1970, p. 147
4. A. Behrendt, Proceedings of the Fourth International Conference on Rain Erosion, 1974, p. 425