@article{IM2_1990_34_3_a4,
     author = {Nguy\^en Thị Thi\^eu Hoa},
     title = {Oscillation properties of differential operators and convolution operators, and some applications},
     journal = {Izvestiya. Mathematics},
     pages = {609--626},
     year = {1990},
     volume = {34},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_3_a4/}
}