@article{10_14708_wm_v11i1_2127,
     author = {F. Szczotka},
     title = {J. {Perkal,} {Matematyka} dla przyrodnik\'ow i rolnik\'ow, cz. {II} i {III}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 164--165},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1969},
     doi = {10.14708/wm.v11i1.2127},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v11i1.2127/}
}