@article{AUPCDM_2018_10_1_a0,
     author = {Baldwin, John T.},
     title = {Letter to the {Editor,} {Annales} {Universitatis} {Paedagogicae} {Cracoviensis}},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2018_10_1_a0/}
}