1. Krumbein , W. C. R. L. Shreve Some statistical properties of dendritic channel networks 11 13 New York 1970
2. A computer model of some branching-type phenomena in hydrology;Liao;Int. Ass. Sci. Hydrol. Bull.,1968
3. A derivation of Strahler's channel-ordering system;Melton;J. Geol.,1959
4. Scheidegger , A. E. The algebra of stream-order numbers, U.S. Geol. Surv. Prof. Pap. 525-B 187 189 1965