@article{EJDE_1997__1997__a37,
     author = {Ignatyev, Alexander O.},
     title = {Stability of a linear oscillator with variable parameters},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {1997},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1997__1997__a37/}
}