Conservation Aspects of the Concept of Time in Primary School Children.Published in:Journal of Research in Science Teaching, 1969, v. 6, n. 3, p. 257, doi. 10.1002/tea.3660060310By:Murray, Frank B.Publication type:Article
Compensation and Combinatorial Systems in the Acquisition of Generalization of Conservation.Published in:Child Development, 1974, v. 45, n. 3, p. 717, doi. 10.2307/1127838By:Sheppard, John L.Publication type:Article