TY  - BOOK
AU  - Jean
AU  - Sauvy,Simonne
TI  - The child's discovery of space: from hopscotch to mazes ; an introduction to intuitive topology 
SN  - 014080384X
PY  - 1974///
CY  - Harmondsworth
PB  - Penguin Education
KW  - Topology
KW  - Study and teaching (Elementary)
N1  - Translation of L'enfant a la decouverte de l'espace; Bibliography: p. 93
ER  -