@article{10_14708_cm_v21i2_5998,
     author = {W. Wnuk},
     title = {The converse of {Lapunov} convexity theorem},
     journal = {Commentationes Mathematicae},
     pages = { 389--390},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1979},
     doi = {10.14708/cm.v21i2.5998},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v21i2.5998/}
}