Multi-volume work

Ax, P. 1996-2003. Multicellular Animals. Springer.

Volumes

1. Ax, P., 1996 (1995). Volume I. A new Approach to the Phylogenetic Order in Nature: [1]-225.
2. Ax, P., 2000 (1999). Volume II. The Phylogenetic System of the Metazoa: [I]-XXIV, 1-396.
3. Ax, P., 2003 (2001). Volume III. Order in Nature - System Made by Man: [I]-[XIII], 1-317.