H. Sakaguchi et Hr. Brand, A MODULATION MEDIATED HEXAGON-RECTANGLE TRANSITION IN PATTERN FORMINGSYSTEMS, Physics letters. A, 227(3-4), 1997, pp. 209-215
We describe a novel transition between stationary hexagonal and rectan
gular patterns, which is mediated by spatial modulations as the stress
parameter is varied. The model equation studied can be derived from a
Lyapunov functional and is expected to be applicable for systems show
ing spatial variations on large length scales.