1. Inversion of dorsoventral axis?;Arendt, D.,1994
2. The tree – thinking challenge;Baum, D.A.,2005
3. Pattern description, process explanation, and the history of morphological sciences.;Brady, R.H.,1994
4. Communing with the ancestors;Brower, A.V.Z.,2014
5. The roots of phylogeny: How did Haeckel build his trees?;Dayrat, B.,2003