@article{TM_2013__2013_30_261753,
     author = {Aaron Melman},
     title = {A somewhat unexpected concavity},
     journal = {The Teaching of Mathematics},
     pages = {18},
     publisher = {mathdoc},
     volume = {2013},
     number = {30},
     year = {2013},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/TM_2013__2013_30_261753/}
}