@article{CMJ_2005__55_4_a2,
     author = {Lee, Chung-Fen and Yeh, Cheh-Chih and Gau, Chuen-Yu},
     title = {Some oscillation theorems for second order differential equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {845--861},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {2005},
     mrnumber = {2184367},
     zbl = {1081.34031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_4_a2/}
}