@article{MABA_1992_6_1_a5,
     author = {Barbara Zubik-Kowal},
     title = {On {First} {Order} {Partial} {Differential-Functional} {Inequalities}},
     journal = {Mathematica balkanica},
     pages = {75},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/MABA_1992_6_1_a5/}
}