@article{10_14708_wm_v13i1_2002,
     author = {C. Olech},
     title = {K. {Tatarkiewicz} {Rachunek} wariacyjny, cz. {I}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 113--114},
     year = {1971},
     volume = {13},
     number = {1},
     doi = {10.14708/wm.v13i1.2002},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v13i1.2002/}
}