@article{10_4153_CJM_1971_078_8,
     author = {Howe, A.},
     title = {Klein's {Oscillation} {Theorem} for {Periodic} {Boundary} {Conditions}},
     journal = {Canadian journal of mathematics},
     pages = {699--703},
     year = {1971},
     volume = {23},
     number = {4},
     doi = {10.4153/CJM-1971-078-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-078-8/}
}