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        Journal: Mathematics, 2021
        Volume: 9 
                	Number: 1966 
                
        
        Article:
        Levels of Sophistication in Elementary Students’ Understanding of Polygon Concept and Polygons Classes 
        Authors: 
       	by
                    Melania Bernabeu, Salvador Llinares and Mar Moreno        
        Link:
        https://www.mdpi.com/2227-7390/9/16/1966
        
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