From here, the details of all published research is accessable.
Remodelling of Botanical Trees for Real-Time Simulation
Published at Eurographics UK – Theory and Practice of Computer Graphics 2011. Work done to use exported tree data from Xfrog software to generate a complete skeletal heirarcy. Skeleton is wrapped in new, cleaner geometry with full skinning and new OpenGL tessellation engine is used for dynamic level of detail. Full details here.