@article{10_1017_S2040618500035255,
     author = {Chen, Yung-Ming},
     title = {Some integrability theorems},
     journal = {Glasgow mathematical journal},
     pages = {101--108},
     year = {1965},
     volume = {7},
     number = {2},
     doi = {10.1017/S2040618500035255},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500035255/}
}