@article{10_14708_wm_v21i02_3632,
     author = {Z. Opial},
     title = {Matematyzacja dzia{\l}alno\'sci ludzkiej},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 138--148},
     publisher = {mathdoc},
     volume = {21},
     number = {02},
     year = {1979},
     doi = {10.14708/wm.v21i02.3632},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v21i02.3632/}
}