Błaszczyk, P. and Petiurenko, A. 2021. Commentary to Book I of the Elements. Hartshorne and beyond. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia. 13, (Dec. 2021), 43–99. DOI:https://doi.org/10.24917/20809751.13.7.