@article{10_4064_fm179_1_3,
     author = {Piotr Szuca},
     title = {Sharkovski\u{i}'s theorem holds for some
 discontinuous functions},
     journal = {Fundamenta Mathematicae},
     pages = {27--41},
     publisher = {mathdoc},
     volume = {179},
     number = {1},
     year = {2003},
     doi = {10.4064/fm179-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm179-1-3/}
}