@article{10_14708_wm_v4i1_2492,
     author = {J. Mikusi\'nski},
     title = {Trygonometria r\'ownania r\'o\.zniczkowego x(4)+x=0},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 73--84},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1960},
     doi = {10.14708/wm.v4i1.2492},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v4i1.2492/}
}