@book{UBHD-1044299, author={Piaget, Jean and Inhelder, B{\"a}rbel and Szeminska, Alina}, title={La géométrie spontanée de l'enfant}, edition={2. éd.}, publisher={PUF}, address={Paris}, year={1973}, pages={491 S.}, series={Bibliothèque de philosophie contemporaine}, library={UB [Signatur: 75 A 1473]}, }