@article{MV_1968_20_2_a7,
     author = {M. Bertolino},
     title = {Zone d'influence qualitative de certaines fonctions},
     journal = {Matemati\v{c}ki vesnik},
     pages = {189 },
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MV_1968_20_2_a7/}
}