P. J. Ortoleva. Self-organized zoning in crystals: Free boundaries, matched asymptotics and bifurcation. In Pattern formation: Symmetry methods and applications, Fields Institute Communications Vol. 5, edited by John Chadam, Martin Golubitsky, William Langford, and Brian Wetton, 321-333. Providence, RI: Amer. Math. Soc (1996).
