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by Cobb, Paul; Yackel, Erna; McClain, Kay
by Yackel, Erna; Gravemeijer, Koeno; Sfard, Anna
by Yackel, Erna; Gravemeijer, Koeno; Sfard, Anna; et al.
by Erna Yackel; ?Koeno Gravemeijer; ?Anna Sfard