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Distributions of Constant Directional Derivatives and a Model of Spiral Patterns |
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| Authors: | Jin He Xiaoli Yang |
| Institution: | (1) Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, U.S.A.;(2) Department of Mathematics, The University of Alabama, Tuscaloosa, U.S.A. |
| Abstract: | |
| Keywords: | Methods Nonlinear science – galaxies Structure |
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