@article{10_1017_S0017089512000511,
     author = {IZUCHI, KEI JI and IZUCHI, KOU HEI and IZUCHI, YUKO},
     title = {SUMS {OF} {WEIGHTED} {COMPOSITION} {OPERATORS} {ON} {COP}},
     journal = {Glasgow mathematical journal},
     pages = {229--239},
     year = {2013},
     volume = {55},
     number = {1},
     doi = {10.1017/S0017089512000511},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089512000511/}
}