Raji (2003), Igi N da  Lektay Publishers, Ibadan, Oju-iwe 83-86... 
Here, four guJerusalẹmu bases form a Flat plate and these Flat four-base units then stack on top of each other, to form a kẹ́tẹ́kẹ́tẹ́ g-Qtorufẹ́fẹ́ Structure.. 