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Difficulties in teaching the concepts of 'amount of substan..:

Furió, Carlos ; Azcona, Rafael ; Guisasola, Jenaro.
International journal of science education.  22 (2000)  12 - p. 1285-1304 , 2000
Exemplar:  Zentrale: z pae 638 j/734; Zentrale:Magazin Zs fe 1734