@article{10_4064_ap_20_2_95_102,
     author = {W. Pawelski},
     title = {On a case of mixed inequalities between solutions of first order partial differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {95--102},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1968},
     doi = {10.4064/ap-20-2-95-102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-20-2-95-102/}
}