@article{10_4064_cm_27_1_109_123,
     author = {Coke S. Reed},
     title = {Concerning two methods of defining the center of a dynamical system, {II}},
     journal = {Colloquium Mathematicum},
     pages = {109--123},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1973},
     doi = {10.4064/cm-27-1-109-123},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-27-1-109-123/}
}