@article{10_4153_CJM_1973_031_2,
     author = {Gustafson, G. B.},
     title = {Oscillation {Criteria} for y"" + p(t)f(y,y{\textquoteright}) = 0 with f {Homogeneous} of {Degree} {One}},
     journal = {Canadian journal of mathematics},
     pages = {323--337},
     year = {1973},
     volume = {25},
     number = {2},
     doi = {10.4153/CJM-1973-031-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-031-2/}
}