• E. Buzano and M. Golubitsky. Bifurcation involving the hexagonal lattice and the planar Benard problem. Phil. Trans. Roy. Soc. London. A308 (1983) 617-667. [PDF 5.5M]
• E. Buzano and M. Golubitsky. Bifurcation involving the hexagonal lattice. Proc. Symp. Pure Math. 40 (1983) 203-210. [PDF 489K]