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%0 Book
%1 piaget1997csc
%A Piaget, J.
%D 1997
%I Routledge
%K children conceptions number
%T The Child's Conception of Number
%U http://books.google.com/books?hl=no&lr=&id=1ET995R5VHEC&oi=fnd&pg=PA1&dq=altitittel:+number+forfatter:J+forfatter:Piaget&ots=v9XAOH0thw&sig=QGgRd8gEEIVC5JDUrndOwdv6XWM