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2. “Children's Mathematical Thinking: A Developmental Framework for Preschool, Primary, and Special Education Teachers.”;Baroody,1987
3. Manipulatives don't come with guarantees;Baroody;Arith. Teacher,1989
4. Remediating systematic inversion errors in subtraction through the use of demonstration and feedback;Blankenship;Learn. Disabil. Q.,1978
5. “Teaching Mathematics to the Learning Disabled,”;Bley,1989