Translation ability and problem solving A Gagatsis, M 8C Shiakalli Educational Psychology 24 (5), 645-657, 2004 | 342* | 2004 |

The significance of the classroom effect in primary schools: An application of Creemers' comprehensive model of educational effectiveness L Kyriakides, RJ Campbell, A Gagatsis School effectiveness and school improvement 11 (4), 501-529, 2000 | 252 | 2000 |

The Effects of Different Modes of Representation on Mathematical Problem Solving. A Gagatsis, I Elia International Group for the Psychology of Mathematics Education, 2004 | 188 | 2004 |

The effects of different modes of representation on the solution of one-step additive problems I Elia, A Gagatsis, A Demetriou Learning and Instruction 17 (6), 658-672, 2007 | 179 | 2007 |

Relations between secondary pupils’ conceptions about functions and problem solving in different representations I Elia, A Panaoura, A Eracleous, A Gagatsis International Journal of Science and Mathematics Education 5, 533-556, 2007 | 173 | 2007 |

Using diagrams as tools for the solution of non-routine mathematical problems M Pantziara, A Gagatsis, I Elia Educational Studies in Mathematics 72, 39-60, 2009 | 149 | 2009 |

Students' improper proportional reasoning: A result of the epistemological obstacle of “linearity” M Modestou, A Gagatsis Educational Psychology 27 (1), 75-92, 2007 | 131 | 2007 |

Cognitive and metacognitive aspects of proportional reasoning M Modestou, A Gagatsis Mathematical Thinking and Learning 12 (1), 36-53, 2010 | 106 | 2010 |

Teachers’ attitudes towards their pupils’ mathematical errors A Gagatsis, L Kyriakides Educational Research and Evaluation 6 (1), 24-58, 2000 | 102 | 2000 |

Using geometrical models in a process of reflective thinking in learning and teaching mathematics A Gagatsis, T Patronis Educational Studies in Mathematics 21 (1), 29-54, 1990 | 93 | 1990 |

Representational flexibility and problem-solving ability in fraction and decimal number addition: A structural model E Deliyianni, A Gagatsis, I Elia, A Panaoura International Journal of Science and Mathematics Education 14, 397-417, 2016 | 83 | 2016 |

Young children's understanding of geometric shapes: The role of geometric models I Elia, A Gagatsis European Early Childhood Education Research Journal 11 (2), 43-61, 2003 | 75 | 2003 |

Geometric and algebraic approaches in the concept of complex numbers A Panaoura, I Elia, A Gagatsis, GP Giatilis International journal of mathematical education in science and technology 37 …, 2006 | 65 | 2006 |

The nature of multiple representations in developing mathematical relationships A Gagatsis, I ELIA, A MOUGI Scientia Paedagogica Experimentalis 39 (1), 9-24, 2002 | 63 | 2002 |

An intervention to the metacognitive performance: Self-regulation in mathematics and mathematical modeling A Panaoura, A Gagatsis, A Demetriou Acta Didactica Universitatis Comenianae Mathematics 9, 63-79, 2009 | 61 | 2009 |

Geometric and algebraic approaches in the concept of “limit” and the impact of the “didactic contract” I Elia, A Gagatsis, A Panaoura, T Zachariades, F Zoulinaki International Journal of Science and Mathematics Education 7, 765-790, 2009 | 59 | 2009 |

University Students' Conceptions of Function. A Evangelidou, P Spyrou, I Elia, A Gagatsis International Group for the Psychology of Mathematics Education, 2004 | 55 | 2004 |

The structure of students’ beliefs about the use of representations and their performance on the learning of fractions A Panaoura, A Gagatsis, E Deliyianni, I Elia Educational Psychology 29 (6), 713-728, 2009 | 54 | 2009 |

A structural model related to the understanding of the concept of function: definition and problem solving A Panaoura, P Michael-Chrysanthou, A Gagatsis, I Elia, A Philippou International Journal of Science and Mathematics Education 15, 723-740, 2017 | 53 | 2017 |

The role of gestures in making connections between space and shape aspects and their verbal representations in the early years: Findings from a case study I Elia, A Gagatsis, M van den Heuvel-Panhuizen Mathematics Education Research Journal 26, 735-761, 2014 | 47 | 2014 |