@article{MOMA_1977__83_177796,
     author = {Hiroshi Onose},
     title = {A {Comparison} {Method} for {Forced} {Oscillations.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {37--42},
     publisher = {mathdoc},
     volume = {83},
     year = {1977},
     zbl = {0344.34063},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1977__83_177796/}
}