00335nam a2200109Ia 4500008004100000082002100041100002200062245006700084260004800151300001000199650001600209140113s9999    xx            000 0 und d  a581.44'45:581 L5  a"Williams, R. F."  aThe shoot apex and leaf growth: astudy in quantitative biology  b"London : Cambridge university press, 1975"  a256p.  aLeaf growth