%0 Journal Article %T LIGNUM: A Tree Model Based on Simple Structural Units %A PERTTUNEN, J. %A SIEV ÄNEN, R. %A NIKINMAA, E. %A SALMINEN, H. %A SAARENMAA, H. %A V ÄKEV Ä, J. %J Annals of Botany %V 77 %N 1 %P 87-98 %@ 0305-7364 %D 1996-01-01 %I Oxford University Press %~ DeepDyve