@article{10_4064_ap_3_1_157_164,
     author = {W. Mlak},
     title = {The epidermic effect for differential inequalities of the first order},
     journal = {Annales Polonici Mathematici},
     pages = {157--164},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1956},
     doi = {10.4064/ap-3-1-157-164},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-3-1-157-164/}
}