@article{10_4153_CJM_1992_053_3,
     author = {Takahashi, Wataru},
     title = {Fixed {Point} {Theorem} and {Nonlinear} {Ergodic} {Theorem} for {Nonexpansive} {Semigroups} {Without} {Convexity}},
     journal = {Canadian journal of mathematics},
     pages = {880--887},
     year = {1992},
     volume = {44},
     number = {4},
     doi = {10.4153/CJM-1992-053-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1992-053-3/}
}