au.\*:("HELLINGMAN, C")
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The Development of Standardized Tests for Experimental Work in Schools in the NetherlandsALBERTS, R. V. J; VAN BEUZEKOM, P. J; HELLINGMAN, C et al.International journal of science education. 1986, Vol 8, Num 2, pp 135-143, issn 0950-0693Article
