Charalambos Efstathiou, Androulla Petridou, Athanasios Gagatsis & Panagiota Kalogirou
The Impact of Iconic Representations in Solving Mathematical Problems of the Fractions Division

Kalogirou Panagiota, Kattou Maria, Michael Thanasia & Gagatsis Athanasios
The Impact of Different Representations in Solving Non-Proportional Stereometry Problems

Kyriacoulla Evangelou, Katerina Tsimpimpaki & Athanasios Gagatsis
Students’ Performance and Representational Pictures. What Do Students Believe?

Paraskevi Michael, Athanasios Gagatsis, Iliada Elia, Eleni Deliyianni, Annita Monoyiou & Areti Panaoura
Operative Apprehension of Geometrical Figures by Primary and Secondary School Students’