@article{10_14708_wm_v11i1_2097,
     author = {H. Iwaniec},
     title = {O pewnej w{\l}asno\'sci wielok\k{a}ta wypuk{\l}ego i jego przek\k{a}tnych},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 7--11},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1969},
     doi = {10.14708/wm.v11i1.2097},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v11i1.2097/}
}