@article{TM2_2020_XXIII_1_a6,
     author = {Miljan Kne\v{z}evi\'c and Dragana Savi\'c},
     title = {Some remarks on {Ptolemy's} theorem and its applications},
     journal = {The Teaching of Mathematics},
     pages = {57 },
     year = {2020},
     volume = {XXIII},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2020_XXIII_1_a6/}
}