@article{AUPCM_2020_19_a1,
     author = {Pasteczka, Pawe{\l}},
     title = {Jensen-type geometric shapes},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica},
     pages = {27--33},
     publisher = {mathdoc},
     volume = {19},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPCM_2020_19_a1/}
}