@article{JNSA_2016_9_10_a2,
     author = {Zhu, Jinhua and Chang, Shih-Sen and Liu, Min},
     title = {Viscosity approximation methods for hierarchical optimization problems of multivalued nonexpansive mappings in {CAT(0)} spaces },
     journal = {Journal of nonlinear sciences and its applications},
     pages = {5521-5535},
     publisher = {mathdoc},
     volume = {9},
     number = {10},
     year = {2016},
     doi = {10.22436/jnsa.009.10.03},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.22436/jnsa.009.10.03/}
}