@article{10_4064_ap_20_2_179_181,
     author = {A. Pli\'s},
     title = {On difference inequalities corresponding to partial differential inequalities of the first order},
     journal = {Annales Polonici Mathematici},
     pages = {179--181},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1968},
     doi = {10.4064/ap-20-2-179-181},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-20-2-179-181/}
}