1. UTB;P. Ax,1988
2. Bechly, G., 2000. Mainstream cladistics versus Hennigian phylogenetic systematics. Stuttgarter Beitr. Naturk. Ser. A 613, 1–11.
3. Bock, W.J., 1989. The homology concept: its philosophical foundation and practical methodology. Zool. Beitr. N.F. 32, 327–353.
4. Brower, A.V.Z., Schawaroch, V., 1996. Three steps of homology assessment. Cladistics 12, 265–272.
5. Bryant, H.N., 1989. An evaluation of cladistic and character analyses as hypothetico-deductive procedures, and the consequences for character weighting. Syst. Zool. 38, 214–227.