@article{10_4064_ap_8_2_139_153,
     author = {W. Mlak},
     title = {Parabolic differential inequalities and {Chaplighin's} method},
     journal = {Annales Polonici Mathematici},
     pages = {139--153},
     publisher = {mathdoc},
     volume = {8},
     number = {2},
     year = {1960},
     doi = {10.4064/ap-8-2-139-153},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-8-2-139-153/}
}