Diffusion-limited aggregation

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Diffusion-limited aggregation is the process whereby particles undergoing a random walk due to Brownian motion cluster together to form aggregates of such particles [1]. This theory, proposed by Witten and Sander in 1981 [2], is applicable to aggregation in any system where diffusion is the primary means of transport in the system [1].

References

[1] http://en.wikipedia.org/wiki/Diffusion-limited_aggregation

[2] T. A. Witten Jr, L. M. Sander, Phys. Rev. Lett. 47, 1400 (1981)