@article{10_4064_am_6_1_7_17,
     author = {W. Rudzki},
     title = {Dok{\l}adno\'s\'c oceny w{\l}a\'sciwo\'sci \'sredniej produkt\'ow bezkszta{\l}tnych},
     journal = {Applicationes Mathematicae},
     pages = {7--17},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1962},
     doi = {10.4064/am-6-1-7-17},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-6-1-7-17/}
}