1. Davis, W. M.,The Peneplain: Geographic Essays, Boston: Ginn, and Co., 1898 (review 1909), 350–380.
2. Gilbert, G. K., The convexity of hill slope,J. Geol. 1909, 17: 344.
3. Adarns, G., Planation surfaces, Dowden, Hutchinson and Ross,Inc. Strouds Burg., Pennsylvania: Halsted Press, 1975.
4. Cui, Z. J., Gao, Q. Z., Liu, G. N., Planation, paleo-karst and the uplift of Qingzang Plateau.Science in China, Ser. D, 1996, 26(4): 378.
5. Hudel, J., The relief types of the sheetwash zone of southern India on the eastern slop of the Deccan Highland towards Madras,J. Colloquiurn Geographicum, 1965, 25(8): 93.