Number comparison skills of children with moderate intellectual disabilities. (English)
Clarkson, P.C., Technology in mathematics education. , (ISBN 0-9596844-6-8). 72-79 (1996).
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Counting Skills and Number Concepts of Students with Moderate Intellectual Disabilities. (English)
Intl. J. Disabil. Dev. Educ. 50, No. 3, 325-45 (2003).
2