Kumon M first advocated the definition of the caudate lobe based on the portal segmentation of the liver in 1985, and classified it into three parts, Spiegel lobe, paracaval portion and caudate process. 
Kumon M
Prof. Couinaud defined the dorsal liver as a union of segments I and IX in 1994, based on the spatial position to the major hepatic veins, hilar plate and inferior vena cava.  In Couinaud's classification, right-side of the dorsal liver is supplied by the branches from the posterior and anterior sections. 
Couinaud