@article{10_1017_S0017089500004614,
     author = {Plant, Andrew T.},
     title = {A note on the modulus of convexity},
     journal = {Glasgow mathematical journal},
     pages = {157--158},
     year = {1981},
     volume = {22},
     number = {2},
     doi = {10.1017/S0017089500004614},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500004614/}
}