Bio-inspired network optimization in soft materials — Insights from the plant cell wall R. R. Vincent, A. Cucheval, Y. Hemar and M. A. K. Williams Eur. Phys. J. E, 28 1 (2009) 79-87 Published online: 13 January 2009 DOI: 10.1140/epje/i2008-10416-2