@article{AUPCDM_2019_11_1_a2,
     author = {B{\l}aszczyk, Piotr and Petiurenko, Anna},
     title = {Euclid{\textquoteright}s theory of proportion revised},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {37--62},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2019_11_1_a2/}
}