@article{AMI_2020_52_a23,
     author = {Csaba Szab\'o and Csilla Bereczky-Z\'amb\'o and Anna Muzsnay and Janka Szeibert},
     title = {Students{\textquoteright} non-development in high school geometry},
     journal = {Annales mathematicae et informaticae},
     pages = {309--319},
     publisher = {mathdoc},
     volume = {52},
     year = {2020},
     doi = {10.33039/ami.2020.12.004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.33039/ami.2020.12.004/}
}