Source of LaplacianGrowth

- Fast Simulation of Laplacian Growth
--  http://gamma.cs.unc.edu/FRAC/laplacian_large.pdf
- Complexity and criticality in Laplacian growth models
--  https://arxiv.org/pdf/cond-mat/9208003.pdf

- THE UNIVERSITY OF CALGARY
--  http://algorithmicbotany.org/papers/runionsa.th2008.pdf