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3Novic, S and Nussbaum, J. (1981).Pupils'understanding of the particulate nature of matter:A cross age study. Science Education, 65(2),187-196.
4Brook, A,Briggs, H and Driver, R. (1984).Aspects of Secondary Students'Understanding of the Particulate Nature of Matter. Children's Learning in Science Project. Centre for studies in science and Mathematics Education, The University of Leeds.
