@article{MS2_1977__40_166535,
     author = {Per Sj\"oln},
     title = {An inequality for convex curves in the plane.},
     journal = {Mathematica Scandinavica},
     pages = {293--300},
     publisher = {mathdoc},
     volume = {40},
     year = {1977},
     zbl = {0369.52005},
     url = {http://geodesic.mathdoc.fr/item/MS2_1977__40_166535/}
}