| author: | Child CM |
| title: | Studies on the Dynamics of Morphogenesis and Inheritance in Experimental Reproduction. VI. The Nature of the Axial Gradients in Planaria and Their Relation to Antero-Posterior Dominance, Polarity and Symmetry. |
| publication: | Archiv. für Entwicklungsmechanik der Organismen, 37: 108-158 |
| year: | 1913 |