@article{PMF_1916_27_1_a0,
     author = {Straszewicz, S.},
     title = {Przyczynek do teoryi mnogo\'sci wypuk{\l}ych},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1916},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1916_27_1_a0/}
}