@article{10_4064_ap_13_2_173_204,
     author = {Z. Kowalski},
     title = {The polygonal method of solving the differential equation y' = h(t, y, y, y')},
     journal = {Annales Polonici Mathematici},
     pages = {173--204},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1963},
     doi = {10.4064/ap-13-2-173-204},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-13-2-173-204/}
}