1. De la logique de l'enfant à la logique de l'adolescent: essai sur la construction des structures opératoires formelles.;B Inhelder,1955
2. Understanding natural dynamics. J. Exp. Psychology: Human Percept.;DR Proffitt;Perform,1989
3. Philosophiæ Naturalis Principia Mathematica;I Newton,1687
4. Is this object balanced or unbalanced? Judgments are on the safe side. J. Exp. Psychology. Human Percept.;F Samuel,2010
5. A new solution to the problem of the subjective vertical.;H Mittelstaedt;Naturwissenschaften,1983