Sarén, M.-P., Serimaa, R., Andersson, S., Saranpää, P., Keckes, J., & Fratzl, P. (2004). Effect of growth rate on mean microfibril angle and cross-sectional shape of tracheids of Norway spruce. Trees, 18(3), 354-362. doi:10.1007/s00468-003-0313-8.