Authors
David Fuys, Dorothy Geddes, Rosamond Tischler, The Van Hiele Model of Thinking in Geometry among Adolescents, Journal for Research in Mathematics Education. Monograph, Vol. 3, The Van Hiele Model of Thinking in Geometry among Adolescents (1988), pp. i+1-196
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Fuys et al. (1988) studied this question.